How can I uninstall firefox 4.0 and reinstall 3.6?

After installing 4.0 I lost the AVG tool bar which, after a lot of messing around, i lost all my AVG files. This problem is now solved.
Now when I try to log in on my on line banking account it tells I am already logged in on another browser and it sends me back to its homepage. Apparently the other browser must be FF3.6.

Thanks. I tried this and it actually works for the desktops shortcuts but when I pin the modified shortcut to the task bar and try to start either of the two firefox versions from there, the profile manager shows up and asks which profile I wanna use.
Is there a way to fix this?

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After i update to 36.0.1 my mac becomes extrimly slow. Can i uninstall 36.0.1 and reinstall 35.0.0?

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