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Here's what's new in Microsoft Edge in Windows 10 build 10166

Along with the newly-released Windows 10 PC build 10166 comes a new version of the Microsoft Edge browser with a smattering of changes. Microsoft has posted the changelog for this latest version, which doesn't include any major feature additions, but does bring some bug fixes and improvements. Here's what's new in the late version of Microsoft Edge on Windows 10 build 10166:

  • localhost loopback is now enabled by default. You can toggle localhost by navigating to about:flags.
  • Improved support for about:flags in locales other than en-US
  • Bug fixes

And if you're upgrading from an earlier version of Windows 10 that still has the Project Spartan branding for the new browser, it's worth mentioning that Microsoft Edge has a new app ID, so you'll want to back up your favorites, cookies, history, and reading list items before upgrading:

To save your favorites, follow these steps before upgrading:

  • Copy your favorites from %localappdata%/Packages/Microsoft.Windows.Spartan_cw5n1h2txyewy/AC/Spartan/User/Default/Favorites
  • Save them to %userprofile%/Favorites.
  • After upgrading to the next build open Microsoft Edge, choose Settings, and you'll see an option to import favorites from another browser. Choose Internet Explorer to import the favorites you saved in your %userprofile% directory into Microsoft Edge.

And there you have it. While there's nothing to get too excited about, it looks like Microsoft is adding some polish to its apps and services ahead of Windows 10's July 29 release date.

Source: Microsoft

Dan Thorp-Lancaster is the Editor in Chief for Windows Central. He began working with Windows Central as a news writer in 2014 and is obsessed with tech of all sorts. You can follow Dan on Twitter @DthorpL and Instagram @heyitsdtl. Got a hot tip? Send it to daniel.thorp-lancaster@futurenet.com.

178 Comments
  • Still no tab thumbnails? I wonder if that's coming before the 29th.
  • I doubt it, but obviously I'm nothing to do with MS. Seems to me MS have a history of shipping half complete products and then wondering why they bomb with the general public.
  • Just like all the linux distros with a lot of fixing updates? Or OSX? Everyday people efforts are lower...
  • I was wrong in a comment I made earlier today. asylumxl wins the "I must find something, anything to whine and complain about" award for today.
  • Nohone, aaylumxls point is dead on accurate. Win 8, Xbox One, and Windows Phone 7 and 8 were both shipped wayyyyyy before they should have been. Software development these days is about cycles instead of completeness. Its not about what can be FINISHED, by rather want can be included by a deadline. Its not specific to Microsoft, but they used to be much, much better at it in comparison to others. Its sad that they are releasing half -baked products. Consumers are itching for completeness right now and its a misstep to become just another incremental release company.
  • I think they are getting products out that work and do their main jobs. Other features get added in later. No matter what, these platofroms thrive on Developers and consumers. Get the console out there so games can be developed and early adopters and enthusiasts can get the latest and greatest. Same for phone side.
  • No, consumers are not itching for completeness. People complain about how Bing maps are no good outside the US. Apple released their Maps app that was absolutely terrible globally to the point that Tim Cook himself suggested that you should download Nokia's maps app. But one major tech web site wrote it is not the greatest maps app, but we should give Apple a pass because they tried really hard. Apple releases a new streaming music service that is far behind the competition in terms of features, quality (another major tech site wrote "Apple Music's bit rate may be lower than Spotify's, but it shouldn't matter"), and just plain stinks - one of the biggest Apple supporting tech sites gave it a 7.0 (I don't recall any Apple product getting lower than a 9.7) and yet still wrote "Apple Music is messy, slow to load, complicated to set up", "we’re stuck with a problematic streaming service for the next few months", "buggy, complicated, yet still destined for success." "Apple will probably address some of these issues at next year." Then that tech site disabled commenting before anyone could so that they would not have to hear any negative Apple comments. Apple has skipped 3G and it was good because it will kill the battery. They skipped a camera in the iPad while the iPhone had one, and it was good because who wants to take pictures with a tablet - only to be praised for adding a camera the next version. Apple told us that they could not support Siri on older iPads, then later an OS update added it. Playstation 4 shipped without many multimedia features, no CD playback, no media playback off of USB, not support for media servers. And all that is OK because a games console is supposed to be for games. But XB1 didn't have Blu-Ray 3D playback on day one (neither did PS4, BTW) and Microsoft failed their customers. The tech media has groomed the population to accept mediocrity. A few days ago someone here was having an absolute fit because Edge does not have Paste And Go like FF. Neither Chrome, nor IE, nor Safari have it, but since Edge doesn't it is as if Microsoft has completely botched the release of Win10. Major features from other companies are left out of products during ship, and we are supposed to be happy about this. The tech media praises Apple because they remove critical feautes at the last minute if it does not seem like it is ready - cameras, NFC, fingerprint readers, etc. But then the tech media, and people like yourselves scream bloody murder because of a thumbnail. Really? You want Windows 10 to be delayed for a thumbnail? One web site today took Microsoft to task because they "finally" released their WiFi purchasing app. An app that is for Win10 is somehow late when the OS hasn't even been released yet. People only are itching for completeness if it is Microsoft because the media has trained them for it. For every other company, shipping half-baked features is actually encouraged.
  • Well said my brother, well said.
  • Superb bro... The reality
  • Well said, fed up with cry babies
  • yo nohone. lol calm down brah. No need for the hating
  • Hating is sometimes needed to knock some sense into the haters who jump to stupid conclusions.
  • +640
    Btw, Apple needed 4 updates, and 6 months later, to fix the problem with the wifi in Yosemite - the problem was the iMac was constantly loosing the Wi-Fi signal and the user had to turn off Wi-Fi and turn it on again. This was a big and annoying issue and apple took 6 months to fix it.
    Of course, Microsoft can't deliver a product without icons on tabs...
  • Bro. Even thou your comment is long but it was worth reading. Well said I tell ya.
  • Beats 1. 24h live radio is 50% complete.
  • ...Amen Posted via the Windows Central App for Android
  • Windows as a Service, there will never be another 'Completely Finished' Windows again. If its not in the latest build then it may be in the next one or the one after that or maybe never
  • I really like the approach of 'updatability' of Windows 10 and I do understand that it will 'never be complete' because technically in software development, there is really no final but only deadline. Still its very disappointing that promised features won't make on launch and I think first impression really do matters and it affects the brand for a long time, affecting growth. I hope Windows 10 will still be smooth sailing at launch despite if several setbacks.
  • No need to be disappointed or unhappy about Windows because it's not as if it's the only OS out there. There's always OSX, or Linux, etc. If one's unhappy, better to move out and move on. Personally, I've always been happy with Windows, and I'm happy with the way W10 is moving along... so I prefer to stick it out with the OS.
  • osx and linux are not replacements for windows 10 lol.  can you install and game and click play to play it on linux, not in any version of linux i have seen. osx is a mobile phone os and i used it for 6 years and still 8.1 was the best to me on the phone.So really as a desktop user there isnt a viable alternative to windows and there probably wont been for a long long time.  Phone on the other hand is all about personal choice.
  • Exactly black prince. This is the last version of Windows, new features will keep coming through updates. So this obviously won't be finished come July 29.
  • I'm runnng 10162 now on my SP3 and it runs well. It is not even GA yet and is 95% complete.  
  • That describes Google far more than Microsoft. Every product Google releases is in a beta state.
  • You know what. If you think it's not finished, do not use it until you find it worthy of being finished. Do not worry about the general publics opinion and your enjoyment will go way up.
  • Have you ever consider the amount of code needed to do a new OS and considering that Microsoft usually have backwards compatibility?
  • moron.
  • Looking at you, WP 7.0 Posted via the Windows Central App for Android
  • I read somewhere that the tab thumbnails would be released after GA.
  • Yea I think people don't understand what stage we're in. People may as well forget about new features prior to its release. In fact MS has said so many times now. Only expect bug fixes, stability and maybe some performance improvements for now and a while after release.
  • Ya I remember reading something like that myself. It seems a majority of people commenting before researching these days. It's funny and hilarious.
  • i love windows 10 on both the phone and desktop baring outlook whuich i personally dont like at this stage, but sorry if your gona advertise built in skype features  in 2014 in windows 10 both in phone and desktop then people have a right to be angry when they release the os without this feature.  NExt time dont mention features untill closer to the time that you can bring them in, its a huge disapointment for waiting fansboys like me.
  • It seems no sign of it and current Edge will be as it is at launch. Fortunately they will just add it later. Its just kind of "trollish" feeling for me since they repeatedly show the tab thumbnails on Edge video and Windows 10 video, yet no sign of it during preview release and no word from them about it. Not to mention Groove (Music) shown with drag-n-drop feature and Photos app Albuns are animated with people tagging o mn it but current state is still abysmal. Not to mention People app is still looks alpha and Microsoft felt like they forgotten about it.
  • It's one thing to add new features after release, but its just ridiculous to advertise features that won't be available at release, such as tabbed thumbnail previews.
  • yeh i agree and thasts a issue they need to aproach internatly and through marketing department caus elike the last few years their marketing sucks.
  • Still no tabs for windows file manager... what an incredible disappointment... how many people and how many years have people been asking for this one simple freaking thing Microsoft? It is just a dickish move not to add in this functionality! Tabs is the 5th most requested feature!!!!
    https://windows.uservoice.com/forums/265757-feature-suggestions/filters/top
  • Well to be fair, Aero Glass is the 3rd most requested and that's probably not gonna happen...
  • Neither is the 1st most requested feature. Lol
  • and from build 10130 to 10158 they removed aero glass from the tasbar... just why?! hopefully its just broken.
  • I thought that was confirmed to be coming with the XAML file explorer?
  • Have you completely missed all the articles and statements that say there will be no more features added before GA?
  • I will never understand this complain. Tabs make sense in a browser where you basically never look at two sites at once or even drag things from one site to another. Tabs in File Explorer would make every action more complicated. If you have to work regularly with multiple locations, pin them to the Navigation Bar to jump between them. Disable Taskbar grouping and voilá you have your tabs of file folders and can even arrange multiple windows ;)
  • This^
    I really don't use it at all on my linux installs. Multiple windows are the way to go in file management. Now the multiple desktop on the other hand is super useful and for me now indispensable!
  • OSX have tabs and I don't use it. I prefer by far have different windows than tabs.
  • i use tabs all the time, i have 2a 3 monitor set up, 1 for movies and tv shows, 1 for gameing and general browsing and the 3rd to drag and drop certain tabs to a seperate screen to read, its very productive and to me a vital part of how i navigate withing a browser, unfortunatly edger isnt there yet where explorer already has been for a long time.
  • then download a file manager with tabs. problem solved. that's how nice Windows is with many 3rd party apps. I know you want to complain, but people like me with 2 or more monitors don't need tabs for a file explorer. its not even that useful if you pin the windows side by side.   also only because it's requested it doesn't mean it automatically have any priority. Feedback and request is that, it might happen or not. so I don't understand the dissapointed if you can get 3rd party apps for that. maybe you can go to Linux or OSX or android and see if you can find it. stay there and then be happy.
  • "maybe you can go to Linux or OSX or android and see if you can find it. stay there and then be happy" - You sir, are very wise! If one is unhappy where he is, then move out and move on. I can't understand why people are forever complaining when they can just go elsewhere and be happy there. I'm contented with Windows so I prefer to stick it out with the OS.
  • To be fair, developing a new File Explorer can be incredibly challenging. Maybe it will be Universal app which is a challenge itself. Looks like we will have it around Redstone or even longer. I'm also wishing to have new folder looks like from new OneDrive on the web. We just hope when they release a new one, it won't be half-back and it should be well thought out.
  • Tabs on file explorer? The f.... I know your some of the advance user but normal consumer will not use it the same as the alt+tab, only 20% are using it.
  • Now let's make Edge in W10M fully functional :)
  • Stopping it crashing on every site would be a start. I know my test phone has 512mb RAM but so do a lot of phones.
  • Seems faster
  • So when are we getting the file explorer universal app? I expected it by now.
  • No new features before GA, that's been stated so many times by now.
  • But the app exists in Windows phone and it's meant to be universal... It isn't a new feature.
  • The point of Windows 10 is getting features over time, only because it's RTM it doesn't mean Microsoft can't update it, they will, there are planned features after release. so it's only matter of time to get these things. also they have to probably plan File Explorer well, because if it is goning to replace the current one, it has to bring a good UI with similar features.
  • I really hope it will be really good when the new File Explorer is introduced since they're not rushing it with RTM release (though I wish its included on RTM). There are tons of features already on current File Explorer so this is a real challenge to make it an Universal App. We don't want a lite version of it nor a two File Explorer. They should've at least make the UI more touch friendly when on Tablet mode like with Office 2013, not perfect but at least its bearable for touch without a need of massive redesigning.
  • It is a new feature because the phone app is *not* universal. Desktop already has a file manager to launch with.
  • Unfortunately, don't wait for it. We will have it on future update. Maybe with Redstone release or maybe even longer. Since they we didn't have it on launch. I hope they will make a new one which isn't half-baked and a true upgrade from the current one.
  • Please, please, please enable support for swiping forward or back. The arrow buttons are pretty small on the 8" tablet I have been playing with.
  • This is the one feature I love in chrome that I want in edge
  • Me too! Modern IE has it and it was joy.
  • This was present before in IE Modern app I believe. Wonder why this didn't make it in Edge. They probably will add this in future updates
  • They should at this after RTM. I don't even know why they didn't make it earlier.
  • Even more puzzling, why remove the IE immersive interface? Why not keep it until Edge is up to speed? That would have taken zero effort and cost. MS need to THINK before acting.
  • This is the #1 reason why I keep going back to W8.1 on my Surface Pro 3. If Edge doesn't support swiping back and forth, it's WORTHLESS for tablet use. The #2 reason is again Edge not importing the sorted order of my favorites from IE app/program. The last time I tried to manually change the sort order (the default is alphabetical) in Edge, it kept going back to the default order. Worthless for either tablet or desktop mode.
  • That feature is one of MANY I love in the Metro IE of Windows 8.  I almost never use the desktop version.  Edge is a horrible browser in almost every way.  STILL.
  • Can anybody tell me the size, currently in Jordan and the connection is bad as shit :/
  • About 7.5"
  • Seems definitely faster.
  • Still cannot find my NAS network drive. I had that in the December build?????? Still cannot sort People by last names!  
  • You have to add it as a netwrok drive, make sure you check use alternate credentials.
  • They seriously removed People sorting options? Ugh.
  • People app is still, sorry to say, its garbage. I rather have the old Windows 8.1 People app on Windows 10 at launch or not have at all until its really ready. Its sad that even now there is no progress and I guess it will be released with this state at RTM.
  • They need to add the ability to show icons only in the favorites bar.
  • It will be there by RTM time, they said that to me on Twitter.
  • i just hope it isn't just a switch you have to flip. Some of my favorites I only want the favicon others I want the name.  
  • Good to know that
  • plse plse plse i so want this feature in edge.
  • The favorites bar FINALLY leaves things where you put them and allows for better reorganization using the hub.  Now I can finally make the switch!
  • It doesn't let you organize folders for favorites yet (which is really annoying).
  • I can organize folder there, what do you mean?
  • It lack the ability to right click a fav folder and open all in new tab, for we that was the whole point, almost
  • They told that "it's on their radar" already.
  • Does it actually save the order that you place the folders? After you close Edge and reopen it are the folders still organized like you set? Mine do not save (after closing and restarting Edge they are alphabetical again), but maybe that is because I have nested folders.
  • With 10166 yes. 
  • You can move folders around, but as far as I can tell, if you put a folder in a folder there's no way to move it back out.  I kept having to delete and re-import from IE.  Fortuntately, re-importing only adds what's not already there and doesn't create a bunch of duplicates.
  • By Favorites Bar, do you mean the Favorites Pane?  Or the Favorites Bar folder?  So far, I can't find any way to actually get a Favorites Bar as a Bar... 
  • Under settings there is a switch for showing a Favorites Bar.
  • Thanks, I missed that.
  • Share web notes via email!
  • I don't have the option to put a hole button in the title bar despite them adding it last build
  • Advanced Setting, there.
  • Trident and "Welcome to Paradise" :))
  • When I click 'import favorites from another browser' I get 'Could not import favorites. Even though they are present in my \Favorites Anyone else experience this as well?
  • It still sucks, reading list doesn't sync across platforms. When I save a web article to my reading list on my PC, I should be able to open it on my Edge browser on my phone but it doesn't.  
  • Mobile version of Edge is far from being done. Reading list is meant to be sync. And it will at RTM.
  • This should be included with RTM. Syncing is a norm for web browsers nowadays and this will cause disappointment for users. Not a good first impression for a fresh new browser.
  • Not synced with Mobile yet.
  • More importantly for me it lacks for now the history sync, so I can pick up where I left between phone and PC. But it's sure coming, it's there between IE 11 modern and WP 8.1
  • They need to fix Favorites management prior to release.
  • Nice new apps show up in Recently added.  Hated searching through the list.
  • cool volume control shows a picture of the app using the audio.
  • Why can´t I open multiple favorites at once in the new browser? IE allows to right click a favorites folder and choose the option to open all favorites links at the same time. Why this isn´t implemented in Edge yet?
  • Better yet, mouse wheel click on links opens in new tabs.
  • This. Especially if you maintain folders in the favourites bar.
  • Well I guess because no one is requesting it. It seems they only add things based on popularity not by because other browsers have it. :/
  • I have requested it. I know maybe I´m the only one, but I doubt it, and by the way: IE got this.
  • If that's the case then Edge will fail big time. It will just be "a new way to download chrome" :P
  • Oh yes, it has been requested a couple of times, even by me. It's a essential part of using a browser for me.
  • How about better html5 support? On this site it still shows a score of 402 since the last 4 builds or so: http://html5test.com/
  • That score is well known to be flawed.
  • It's feature based not performance based, not flawed.
  • No, it's full of features that are not yet standard or may not even be approved by the standards body. Therefore as a standard of browser feature completeness it is flawed.
  • Flawed or not, it still doesn't support as many features as the other browsers on the market
  • Bye bye internet explorer, Edge is now my default browser it can now launch Plex server and a possibility it can now launch my ftp server. Yaay
  • Good to hear this
  • THIS and it looks amazing with dark theme haha     
  • Plex server still have some issues on MS Edge
  • Still no support for Tracking Protection Lists?
  • Well sorry to say but it will be released without it. We'll see after RTM. :(
  • Too bad edge doesn't support adblock. Otherwise i would switch from ie
  • Hosts file is your friend
  • Not everybody wants to modify the Host file or know about it.
  • what is Host File? same as the OP, im not using Edge yet because no adblock
  • Still no tracking protection?
  • If they're all about aligning with what the general public are used to (re:Hamburger menus) why don't they just call them 'Bookmarks', like every other Browser.    
  • Hope they sort the photo app out. Hate how it organises by date and not folder names like 8.1 did, and that it takes forever to find albums now the small thumb view has gone......
  • Their albums still quite a mess for me. Its fully automatic and not option to make albums manually. They also forgot about OneDrive albums to be included on Photos app. No Device/Camera import either Not to mention it doesn't even animate like from the demo. Well just see after the RTM. For now I feels so incomplete. Its just a overblown photo viewer for now that many users might even forget about it at launch.
  • Still stuck on 59!! Wtf
  • What does GA mean and when can we EXPECT it? Please excuse my ignorance.
  • General Availability. This is July 29th, though because of the staggered rollout you may get it a few days to a couple of weeks later depending on when you accepted the update in your current OS.
  • Hi there.i have a question.in windows 10 for mobile 4 Column tile available for 5 inch mobile??(lumia 535,540,830,930,...)
  • I really want to see some improvements in the file system. Folder tagging custom colours etc..
  • I was also wondering why for so long we still don't have Folder tagging just like we have on file tagging.
  • Still no drag and drop?
  • No paste and go .. Whats is MS thinking ??
  • Can someone translate "localhost loopback is now enabled by default. You can toggle localhost by navigating to about:flags" into plain English?
  • You can now access sites served on your local machine by default (before you had to run a command in PowerShell to unlock it). This is important for web developers.
  • Did somebody test Win10 with something like XAMMP and large databases? Like 400Mb+ SQL's? On Win7 this will terribly slow down things while testing a website locally, and I was hoping that Win10 kind of sorted this.
  • Is it just me, or can't you save your "clip" to the desktop or something as an image ? I don't want it in Onenot​e, and I don't want it in Reading List, and I don't want to paste it into Paint and Save As :/  
  • I want this too!
    OneNote integration is great but sometimes I just need an image file to send to someone without the hassles of sharing via OneNote.
  • Sending out a complete build for 3 small fixes. :( I'm not updating this one, I can't give any additional feedback about this build, I have no use of local host.
  • These changes are just for edge. There are lots of bugs fixed in windows itself.
  • Reading many of the comments here and over the last few weeks and months, maybe the good folks at Windows Central should change the name to Whiner's Circle.
    Seriously, first everyone whines because it takes too long between builds. Then everyone whines because build are not stable and come too fast.
    First people whined about W10 taking soooooo long to be released. Now everyone whines because not everyone gets every feature they want. Seriously folks, we are supposed to be the Windows fans here. I don't even want to know what the haters have to say. Chill a bit. Let them release a solid, stable version and ad on from there. And if that is too much to ask, write your own damned OS.
  • Completely agree!
  • You clearly are missing something.  Not everything is about what's broken.  A LOT of the complaints are about DESIGN CHOICES.  A few of us actually loved the features and choices in Windows 8 and find most of what has been done with Windows 10 as absolutely bad.  So, you're darn right, we're going to complain.
  • Will it support my Dashlane password manager?
  • Not currently. Extensions will be supported later and the company will have to create a new extension different than ie. It has its own password manager though that you can use now.
  • It is great to see that they have implemented the ability to tear a tab out of a browser instance and have the torn tab appear in a fresh instance.  It is still a little klunky in that you don't see the page move with the curser, but instead you see a tiny represrntation of the tab.  Also when you tear a tab out, the new instance appears in a different location to where you drop the torn tab.  Another issue is the fact that a torn tab does not interact with the Aero Snap feature yet.  I hope we get that back. I hope they bring back the ability to pin sites directly to the task bar. I also would like to see more right click options implemented when Edge is pinned to the taskbar.  Right now you cannot right click on Edge on the taskbar and open a new instance.  In mobile/tablet mode, they need to implement top edge swipe functionality.  The functionality in IE11Modern was brilliant in this regard Still I am liking what I am seeing.  Keep polishing      
  • Dislike the fact edge is not as functional as internet explorer in the current state
  • Reading List still doesn't sync with the Reading List app on my Windows phone.
  • anyone know if the audio issues have been sorted?
  • Somewhat, microphone doesn't work. But no more audio off when you change audio bitrate  
  • I just fired up chrome to compare, and Edge is a much better experience compared to it.  This is particularly true if you use a touch screen, Edge is buttery smooth when scrolling and zooming, Chrome just feels weird and clunky.
    <