User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:77.0) Gecko/20100101 Firefox/77.0

Steps to reproduce:

setting toolkit.cosmeticAnimations.enabled to false not working
When you open a tab and load any page.

Actual results:

The tab loading has animation.

Expected results:

The tab loading should not have any animation.

Confirmed. This is a regression. It started happening after the latest update. This option used to work.

There is now animation on the reload/stop button, in the tab icon, and the entire tab is flashing when the page is done loading.

Also, the toolbar button to open the bookmarks menu, now opens the bookmarks menu with an animation.

This is an accessibility option useful for people with neurological problems. Maybe it is useful to have the development and release process with regards to handling accessibility reviewed. Because there is a track record of this type of problem.

Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Firefox/78.0

Hi,

I have managed to reproduce this issue on release version 78.0.1, Beta 79.0b5 and latest Nightly 80.0a1 (2020-07-08).
Further, I will move this over to a component so developers can take a look over it. If this is not the correct component please feel free to change it to an appropriate one.

This is a recent regression, here is the pushlog:
https://hg.mozilla.org/integration/autoland/pushloghtml?fromchange=26952e3b611335a8cba129aca24337b843187144&tochange=5c4212964f7562fbe2013ff13d04de388e0edd58

Thanks for the report.

We don't support this pref anymore, instead we now support reduced motion settings: https://developer.mozilla.org/en-US/docs/Web/CSS/@media/prefers-reduced-motion#User_preferences

Thank you.

However, even with this setting, there is still animation when a tab is loading, and in the menus.