User Agent: Mozilla/5.0 (X11; Linux x86_64; rv:72.0) Gecko/20100101 Firefox/72.0

Steps to reproduce:

Open 10+ tabs, switch from one tab to another

Actual results:

The tab switches properly, but for a brief moment a streched checkerbox pattern is visible on screen (see screenshot)

Expected results:

The tab should switch without glitching

Bugbug thinks this bug should belong to this component, but please revert this change in case of error.

Hi Kuba,

Could you attach your about:support information?

1. Enter about:support into the address bar.
2. Click the Copy text to clipboard button.
3. Paste the clipboard contents into a text editor like Notepad, and save the file.
4. Click the Attach New File button above the description here to upload the file.

Thanks!

sure thing

Thanks!

Couple more questions:

1. Does this reproduce consistently? (I can't seem to repro locally)
2. Could you see if it also happens with Webrender disabled?
   To disable webrender:
   open about:config in address bar
   Set gfx.webrender.force-disabled to true
   Restart browser
3. How long does the checkerboard pattern stay on the screen?

1. Well, yes and no. Although I can't find any way to reproduce it step-by step from boot-up, when it happens then it's very reliable. By that I mean that it seems that certain tabs become "glitched" and stay that way. Switching to them causes the checkerboard pattern to appear.
2. I will try running with webrender disabled for a few days and will report on results.
3. It's only for a brief moment - it was tricky to even take a snapshot of it, because sometimes it flickers at a high rate

This was reported on Linux so blocking wr-mac doesn't seem to make much sense?

I'm glad someone is paying attention! Thanks :)

It seems that after disabling WebRender the problem disappeared.

I have observed this on rare occasions, although I have no STR at this time.

Has anyone seen this bug in the last few months?
bug 1565809 has been fixed in 73 or 74 and I haven't seen such problems since then.

(In reply to Kuba Orlik from comment #8)

It seems that after disabling WebRender the problem disappeared.

Please open about:config, set gfx.webrender.all to true and restart Firefox to check if everything is fine now. Thanks!

I"m running with gfx.webrender.force-disabled set to false and I haven't seen this issue for a long time. Seems fixed to me!

Great! :)