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Re:Getting snappy – performance optimisations in Firefox 13 by CWuestefeld on Friday May 11, 2012 @10:36AM (#3959369)
I leave my browser open always, only closing it to clear out the memory leaks. So start-up isn't terribly important to me.

My FF opens pretty quickly by my standards. What seems to take forever is closing it. It seems to me that there ought to be some performance optimizations to be found in that area.

Re:Getting snappy – performance optimisations in Firefox 13 by pcwalton on Friday May 11, 2012 @11:47AM (#3959789)
Are you using Readability? There was a recent change made to fix massive shutdown hangs when using that addon (or others that use FUEL):

https://hg.mozilla.org/mozilla-central/rev/139e8e845aa5