I seem to be running two versions of firefox at the same time help!

I seem to be running an older version and a new version of firefox at the same time. I run the new version from startup (it forgets previous tabs from last session) and this sadly does not let me use back and forward arrow buttons so its a bit useless. Strangely when I pop an email window up, the older version of firefox appears with the last few tabs I had browsed.
disabling plugins stops browser starting in new version and back and forward arrows work ok.
any help much appreciated!

You can install them both but there are a few steps to take.
When you install Firefox 4 use the custom installation option and choose a different location to install Firefox.
In order to use both versions, you need to create a new profile for Firefox 4 (Firefox stores user data in the profile). Using the same profile with different versions can cause problems. Once you create a new profile you can copy certain data such as bookmarks and passwords between them. You can also use Firefox Sync to keep the profiles synchronized. Finally, you will need to set up shortcuts to launch the correct profile for each version.
The following links show how to do this:
* http://kb.mozillazine.org/Creating_a_new_Firefox_profile_on_Windows
* http://kb.mozillazine.org/Shortcut_to_a_specific_profile
* http://kb.mozillazine.org/Transferring_data_to_a_new_profile_-_Firefox
* https://addons.mozilla.org/firefox/addon/firefox-sync (only needed for Firefox 3.6, it is built into Firefox 4)

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    drwxr-xr-x 3 root root 4096 Feb 8 07:27 firefox-devel-3.7a1pre
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