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I've tried lots of extensions, and I don't keep a lot of them, but despite its simplicity, this one's worth keeping installed. So many, many sites go from hours of checkbox-clicking drudgery to an instantaneous snap that I groan when I'm stuck in a browser that doesn't have this installed.
One minor warning: Checkfox v0.6 seems to have broken compatibility with Firefox 2.0 (tested with Firefox 184.108.40.206/Win32). v0.5 works fine, though. I haven't tested in Firefox 3.0 yet, but the developer claims v0.5 and later work with it.
Get this extension --- you'll be glad you did!
I have a shopping cart software that had lots of redundant orders but no "check all" to delete them all. This addon saved me tons of time!