Open Bug 1877669 Opened 3 months ago Updated 3 months ago

The privileged content process animates scollbars while in the background

Categories

(Firefox :: New Tab Page, defect)

Product:
Firefox
Component:
New Tab Page
Type:
defect

Tracking

()

People

(Reporter: florian, Unassigned, NeedInfo)

References

(Depends on 1 open bug, Blocks 2 open bugs)

Details

(Keywords: perf)

See this profile: https://share.firefox.dev/49hHSca

There are at least 6 opacity transitions on scrollbar elements. The process priority is "background".

In the screenshot track you can see that the about:newtab page was not visible (I just profiled loading the wikipedia home page).

The root cause is probably bug 1548683, but I wonder if there might be additional things we might do to avoid image animations. Especially as even opening the new tab page is not enough to actually see the animation, as the image is below the fold.

The severity field is not set for this bug.
:amy, could you have a look please?

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Flags: needinfo?(achurchwell)
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