Bjorn, your driver version is quite old (from 2021). Can you try ti manually update your driver to latest version? Bug 1878754 had a similar issue where the reporter had an Intel Iris driver from 2021 who had similar issue as you. When they manually updated the drivers to the latest version, their issue was resolved (Reference: ( https://bugzilla.mozilla.org/show_bug.cgi?id=1878754#c17) Can you try to update your graphics driver manually (and reset gfx.webrender.software to FALSE) ?
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Bjorn, your driver version is quite old (from 2021). Can you try to manually update your driver to latest version? Bug 1878754 had a similar issue where the reporter had an Intel Iris driver from 2021 who was seeing similar weird graphical issue as you. When they manually updated the drivers to the latest version, their issue was resolved (Reference: https://bugzilla.mozilla.org/show_bug.cgi?id=1878754#c17) Can you try to update your graphics driver manually (and reset gfx.webrender.software to FALSE) ?