Didn't leave totally, still use it from time to time, mostly in Linux. My reasons to dislike it:
1. Resource hogging
2. Lagging
3. Page load stalling
For fairness, want to state what I like about it, too:
1. Clean interface (pity it's all XUL, should be system API)
2. Universal and really easy support customization and for best extensions (Adblock+, Flashblock, Flashgot, Qui
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