Level 24
This was integrated by default not long after the introduction of Edge Chromium so the flag was superfluous quite some time ago.
Good to know!

Also i found this new flag:
Application Guard Prelaunch
If enabled, Microsoft Edge Application Guard will be prelaunched in the background when recently used. – Windows


Level 24
Tip: DON'T enable this flag if you watch videos in the new Chromium Edge

For a few weeks, I had a bug where I couldn't play any video content in MSEdge, and thought it was just because I was on the canary channel. I thought the bug would resolve itself, but after a while, I realized that something must be wrong as I was the only one experiencing the bug.

After thinking about it some more, and getting really fed-up that I couldn't watch videos of any sort (from Reddit, YouTube, Twitter, etc), I decided to look at the flags I had enabled to see if any of them were causing the issue, and low and behold, disabling this one did the trick.

If you like to enable flags to test new features: DON'T ENABLE THIS ONE! Something about it ruins Edge's ability to play video content, and just shows a black screen instead of the video.

If you know what it does, or you're testing the flag, power to you! Otherwise, just stay away from it. ;)

Enjoy the new Edge experience! I'm excited to see these new vertical tabs.... Seems like an interesting idea....


Staff member
I don't think this is new, but might be of interest for some users.
Extension Content Verification
This flag can be used to turn on verification that the contents of the files on disk for extensions from the webstore match what they're expected to be. This can be used to turn on this feature if it would not otherwise have been turned on, but cannot be used to turn it off (because this setting can be tampered with by malware). – Mac, Windows