We are using the SVG filmstrip approach for https://bugzilla.mozilla.org/show_bug.cgi?id=1352063 and https://bugzilla.mozilla.org/show_bug.cgi?id=1352065. We should use the same approach for the connecting/loading indicators in the tab bar. This will help us validate the approach sooner as well as have consistent implementation to make future maintenance easier.

It should be noted that in the throbber case, the filmstrip approach is going to perform worse than the current animation. A simple rotation is a great candidate for *not* using a filmstrip. But I can see the value in validating the approach and having a consistent implementation.

(In reply to Markus Stange [:mstange] from comment #1) > It should be noted that in the throbber case, the filmstrip approach is > going to perform worse than the current animation. A simple rotation is a > great candidate for *not* using a filmstrip. Right... I think any further perf regression makes this a showstopper. In my book, bug 1352085 is the most important blocker for bug 759252. Bug 1351323 is unfortunate, but maybe something can be done about it from the Gecko side.