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Firefox is on the brink of being dropped by the US Government
(www.brycewray.com)
This is a most excellent place for technology news and articles.
I've had some add-ons break, but I've never had any issues with sheets itself either. Wonder what issues the other guy's been having
I always get annoyed by the copy paste thing. I can't remember which way it goes but you either can't copy paste with the mouse or with Ctrl c/v. That's the only thing that bugs me about FF and sheets.