iirc, 70% of all FF users upgrade within two weeks of a new version. 100% of Chrome users do without realizing it due to auto upgrade. The same is true of Safari and Opera. Who wouldn't?
On broadbandreports.com, a few people don't upgrade cause they don't like a change in the UI. One guy said he hated the orange color of the FF button in the corner and that's the reason he won't upgrade(!). But any product will have crazies and laggards and you can't do anything about them.
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