User Agent: Mozilla/5.0 (X11; Linux x86_64; rv:83.0) Gecko/20100101 Firefox/83.0

Steps to reproduce:

Set gfx.webrender.all to true
Click on Adguard VPN icon in the toolbar.
Attaching about:support info.

Actual results:

When webrender is enabled Adguard VPN displayed a blank page. It was still possible to click blindly on the options (e.g. toggling the VPN on and off, changing the server).
It works normally with webrender disabled.

Expected results:

Adguard VPN panel displays normally with webrender enabled.

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

I've noticed this happens only when MOZ_ENABLE_WAYLAND=1

Here's the terminal output when clicking on Adguard VPN icon in the toolbar:

~ ▶ MOZ_ENABLE_WAYLAND=1 firefox
Can't find symbol 'eglGetNativeClientBufferANDROID'.
Can't find symbol 'eglQuerySurfacePointerANGLE'.
Can't find symbol 'eglCreateStreamKHR'.
Can't find symbol 'eglDestroyStreamKHR'.
Can't find symbol 'eglQueryStreamKHR'.
Can't find symbol 'eglStreamConsumerGLTextureExternalKHR'.
Can't find symbol 'eglStreamConsumerAcquireKHR'.
Can't find symbol 'eglStreamConsumerReleaseKHR'.
Can't find symbol 'eglStreamConsumerGLTextureExternalAttribsNV'.
Can't find symbol 'eglCreateStreamProducerD3DTextureANGLE'.
Can't find symbol 'eglStreamPostD3DTextureANGLE'.
Can't find symbol 'eglGetNativeClientBufferANDROID'.
Can't find symbol 'eglQuerySurfacePointerANGLE'.
Can't find symbol 'eglCreateStreamKHR'.
Can't find symbol 'eglDestroyStreamKHR'.
Can't find symbol 'eglQueryStreamKHR'.
Can't find symbol 'eglStreamConsumerGLTextureExternalKHR'.
Can't find symbol 'eglStreamConsumerAcquireKHR'.
Can't find symbol 'eglStreamConsumerReleaseKHR'.
Can't find symbol 'eglStreamConsumerGLTextureExternalAttribsNV'.
Can't find symbol 'eglCreateStreamProducerD3DTextureANGLE'.
Can't find symbol 'eglStreamPostD3DTextureANGLE'.

(firefox:1708): Gdk-WARNING **: 13:52:39.406: Tried to unmap the parent of a popup

(firefox:1708): GLib-CRITICAL **: 13:52:39.407: Source ID 104 was not found when attempting to remove it

The release manager refused to uplift the fix. WebRender is broken for all Wayland users.

Who is the release manager for 83?

See bug 1672139 comment 27.