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[skwij]

I don't know if Safari 3 is supported yet (the latest version of Safari, comes with Leopard), but I do know for sure that Safari 2 is able to use this add-on.

I use Firefox 99% of the time, and it's compatible with all versions of Firefox 2 *haven't upgraded to Ffx 3 as not all my MUST HAVE extensions have been made compatible yet*.

Either way, just double-click the unzipped file, and follow the prompts. It will install itself.