Firefox 17 won't install on my mac 10.5.8, white circle with cross through, it previously worked an hour ago had to delete because an annoying toolbar add on?!

Firefox worked merely hours ago on my computer, had to delete as I explained above because of a dodgy toolbar from some website, deleted firefox, tried re-installing and won't work. Tried links on other help pages to download older firefox version and comes up with page "Whoops are you lost firefox page" and redirects to where I was. Very frustrating. I just want my firefox the way it was ?!

Firefox 17.0 and above requires Mac 10.6 or higher. The last version made for Mac 10.5.8 is Firefox 16.0.1.

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