Microsoft rolls out the last Edge Dev update running version 91

Microsoft Edge
Microsoft Edge (Image credit: Windows Central)

What you need to know

  • Microsoft released build 91.0.864.1 to Edge Dev Insiders this week.
  • It's the final build of Edge that runs version 91.
  • The build includes a few new features, including expanded printing options and improvements to Math Helper.

Microsoft recently released Microsoft Edge build 91.0.864.1 to Insiders on the Dev channel. It's the final build of Edge Dev that will ship with version 91, apart from potentially a couple of small patches. Since the build is towards the end of the version 91 release cycle, there aren't many big changes. There are, however, a handful of new features.

Here's everything that's new, as found in a Microsoft Tech Community post:

  • Added options to print documents at their actual size or to fit them to the page.
  • Added an option to prompt before closing a window with multiple tabs open.
  • Added the ability to clear Media Foundation data on demand. Note that on-exit is coming later.
  • Enabled Math Helper by default on Mac and Windows now that the rollout has completed.
  • Added a management policy to enable Math Solver.
  • Enabled support for the Chromium management policy to control Explicitly Allowed Network Ports.
  • Added support for ClickOnce on Windows 7.

The build also includes several fixes and reliability improvements:

  • Fixed a crash when dragging and dropping tabs.
  • Fixed a crash on launch that makes it appear as though the browser isn't opening.
  • Fixed an issue where certain websites crash a few seconds after loading.
  • Fixed a crash when interacting with the Favorites popup.
  • Fixed a crash when sorting Collections.
  • Fixed a crash when Collections sync is enabled.
  • Fixed a crash when closing tabs while popups like the Find On Page bar are open.
  • Fixed a crash when Shopping is enabled.

The update should roll out to your browser on its own, but you can also grab the latest version from Microsoft.

Sean Endicott
News Writer and apps editor

Sean Endicott brings nearly a decade of experience covering Microsoft and Windows news to Windows Central. He joined our team in 2017 as an app reviewer and now heads up our day-to-day news coverage. If you have a news tip or an app to review, hit him up at