Firefox no longer opens on my computer.

Firefox refuses to open on my computer, as of this morning. Everything functioned perfectly yesterday, but when I opened the computer this morning, Firefox would not come up. Internet Explorer works, but Firefox suddenly does not. I attempted to fix the problem by uninstalling Firefox and then reinstalling it, but a box kept coming up saying the that uninstall could not progress until I closed Firefox--even though there was nothing onscreen to indicate that Firefox was working. I finally shut the computer down, closing Firefox, uninstalled the program when I brought the computer back up, but I still have the same problem--no visible Firefox. What gives and how do I fix it?

Firefox 3.6 is the last version of Firefox from Mozilla for PPC Mac's. <br />
http://www.mozilla.com/en-US/firefox/all-older.html
For older Macs that aren't supported in Firefox 4 / 5 / 6, try TenFourFox for PowerPC's running Mac 10.4.11 & 10.5.8 . <br />
http://www.floodgap.com/software/tenfourfox/
http://code.google.com/p/tenfourfox/downloads/list

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