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

Steps to reproduce:

1. Boot Fedora 31 KDE Plasma spin installation with kwin-wayland and its dependencies installed, fully updated with updates-testing enabled
2. Log in to Plasma on Wayland from sddm
3. install or update to firefox nightly 72.0a1 (2019-11-02)
4. start konsole
   5 . change directory to that where nightly was installed, then run
   MOZ_ENABLE_WAYLAND=1 ./firefox &
5. set layers.acceleration.force-enabled to true in about:config as recommended at https://bugzilla.mozilla.org/show_bug.cgi?id=1584845#c8
6. close firefox
7. MOZ_ENABLE_WAYLAND=1 ./firefox &
8. Load an https site. An example I used was https://bodhi.fedoraproject.org/updates/?releases=F31
9. Click on the lock icon in the address bar
10. Click on the > button (Show connection details)

Actual results:

I started Firefox Nightly 72.0a1 (2019-11-02) and earlier on Wayland with layers.acceleration.force-enabled=true in about:config. I loaded https sites. I clicked on the lock icon in the address bar. I clicked on the > button which had the popup tooltip Show connection details. Firefox stopped responding and Firefox Nightly (Not Responding) was shown in the top bar. The window colours faded as happens when a Plasma window is unresponsive. I've seen this from 71.0a1 (2019-10-01) to 72.a1 (2019-11-02) on Wayland with layers.acceleration.force-enabled=true stop responding like this each of 10+ times, and I hadn't seen that before with 71.0a1 or earlier on Wayland with layers.acceleration.force-enabled=false. I've had to close firefox when it stopped responding like that because it didn't start responding again.

Expected results:

Firefox should have kept responding normally after clicking the > button.

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

Is this still valid, Matt?

(In reply to Robert Mader [:rmader] from comment #2)

Is this still valid, Matt?

Robert, I haven't seen this problem happen in recent Firefox Nightly versions on Wayland with WebRender enabled in Plasma. I think it was fixed. Thanks.

Thanks!