When running firefox-wayland (1) sometimes (2) new tabs stop rendering, they are clearly loading (spinner is shown on the tab) and I do believe they do actually render, but the final blit of the rendered result to the tab does not happen.
When I tear the tab away from the firefox-window, so that it becomes a new-window then it does instantly show, showing that it has fully loaded (and rendered) but just is not shown.
When this happens the minimize, maximize and close buttons on the affected firefox window also stop working (I'm using CSD). This is a per window thing, new tabs in other firefox windows work fine, the min/max/close buttons on other windows also work fine.
When this happens I'm seeing various messages about IPC problems in my journal,
as such I think this may be related to bug 1585332, note firefox does not crash for me.
1) I think this is firefox-wayland only
2) Seems to happen mostly when having one or more tabs with youtube open
(In reply to Hans de Goede from comment #0)
> When running firefox-wayland (1) sometimes (2) new tabs stop rendering, they
> are clearly loading (spinner is shown on the tab) and I do believe they do
> actually render, but the final blit of the rendered result to the tab does
> not happen.
I'm seeing this too. Note that once the first new tab has stopped rendering, no new tab in old windows can render any more. This issue has been present for a while (at least before 66.0.2), but I don't know how old it really is.