Shared components used by Firefox and other Mozilla software, including handling of Web content; Gecko, HTML, CSS, layout, DOM, scripts, images, networking, etc. Issues with web page layout probably go here, while Firefox user interface issues belong in the Firefox product. (More info)
Created attachment 8757066[details]
This is another variant of bug 1223204.
We notify 'changedAnimations' record to mutation observers when changing keyframes, but at that point, isRunningOnCompositor flag is not yet updated unfortunately.
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