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About this Add-on
By default, new tabs grow into place, and closing tabs will shrink and fade away.
The Options dialog lets you change animation speed, animation quality, and toggle fading.
In clean Firefox profiles with few extensions, the animation appears very smooth. However, it has been my experience that on some extension-heavy profiles the animation may appear jerky or in some cases non-existent. This may be due to one or more conflicting extensions and requires further investigation.
Future versions may feature the ability to slide the tabs around as you drag a tab into a new position. See the clip under "Tab Tear Off" here.