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I have also tested the tarball releases from https:/
The problems are identical with those releases. I tested 94.0.2, 95.0, 96.0b2 and 97.0a1.
I ran all of them with `MOZ_ENABLE_
94.0.2 works perfectly fine, and all the other releases show lag while scrolling, and the GNOME Shell / Mutter process even seems to lock up when Firefox starts a download, prior to the "Save file" popup window.
When run on Xwayland (without the environment variable), all releases run fine.
So "something" has changed between 94.0.2 and 95.0, breaking the Wayland backend at least on gen4 Intel graphics. My only other devices are Pinebook Pro's, using the Panfrost driver. I don't seem to be able to reproduce this on there. But those are arm64 builds, so maybe not the best comparison.