User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.1.5) Gecko/20091109 Ubuntu/9.10 (karmic) Firefox/3.5.5 Build Identifier: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.1.5) Gecko/20091109 Ubuntu/9.10 (karmic) Firefox/3.5.5 Firefox uses animated transitions for things like the "all downloads completed" messages, and for sliding in the info bar for "a plugin is needed" or "a popup was blocked". It would be nice to have a way to disable such animations, either one by one or all together. This can be useful for constrained environments, and also as a personal perference, as moving things can be quite distracting. To give an example outside of Firefox, GNOME's window manager "metacity" has a "reduced resources" mode that similarly disables all animations. Reproducible: Always

Bug 422260 is for the infobar, bug 546842 for widgets (see dependent bug 546837), there might be others. Almost nobody found the animation to be a big problem, Flash performance is a much bigger problem. And Javascript.

But as more and more animations are being added (like tab movement, doorhangers) and planned, disabling them may be of some help to slower systems.

I agree with aceman, there needs to be an option.

There's also bug 601546.

There's bug 586797. The new "Star" button (add to bookmark) is also *annoyingly* animated. The new "empty new tab" gear icon is also animated, and quite slowly at that. Please, please, add a setting to disable *all* UI animations at once.