* Toggle animate=false attribute on arrow panels when toolkit.cosmeticAnimations.enabled is false
* Use preferences-service component to lookup the pref in the arrowpanel binding
* Disable this pref during tests to remove a source of instability and timing-based test failures in chrome/UI tests.
* Enable cosmeticAnimations for tests which depend on existing behavior
* Re-enable cosmeticAnimations pref for browser_ext_popup_select.js which is known to be more reliable with animations
MozReview-Commit-ID: IvA2ySPPmeJ
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extra : rebase_source : effd7fab536294de967661be4dcaaadc5b869db7