[Bug] Flash any time a tab is brought into the foreground

[jenabaivab]

Steps to reproduce

1. Open any tab
2. Go to settings, extensions, downloads, or any other app via home button
3. Switch back to the tab and there is a white flash
4. Also occurs when closing tabs from the tray

Expected behavior

No white flash

Actual behavior

Flashes everytime. Easy to reproduce too.

Device information

• Android device: 10
• Fenix version: 200919 06:03

Same thing happens when I switch apps. The moment FF is brought into the background, there is this bright flash provided I am seeing a tab, not any settings or downloads page.

Edit - You can't see the second flash while going back to Wikipedia due to frame loss in the mp4 to gif conversion. It still exists though.

┆Issue is synchronized with this Jira Task

[PlayXman]

I can confirm that. I'm on 80.1.3 version and I have probably much slower phone (Huawei p10 lite) than @jenabaivab because I can see "the flash" much cleaner whenever I visit bookmarks, history, or settings and return back to web page. It seems like the whole layout is rendered from the scratch - white background, address bar, and after that webpage itself.

It's not so slow, although it's noticeable.

[jenabaivab]

Any fixes for this maybe please? Tried using FIrefox Beta and found this same issue.

[ekager]

This should be fixed now by the solution to #6313