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old icon keeps coming back while new icon goes away

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down loaded new version of firefox.old version of firefox icon does not go away . screen is telling me only one firefox can be opened at one time . the wrong one stays while the newer one i just down loaded disappears

down loaded new version of firefox.old version of firefox icon does not go away . screen is telling me only one firefox can be opened at one time . the wrong one stays while the newer one i just down loaded disappears

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Did you follow instructions in Uninstall Firefox from your computer?

Once Firefox 3.6 is uninstalled, install Firefox 12 using How to download and install Firefox on Mac.

Note: Update also your plugin using http://www.mozilla.org/plugincheck/.