I love using FF v3.6x and don't wan't to lose my Add-ons and Plug-ins, however I would love to try v4.0. Is there a way to install v4.0 in addition to v3.6 so I can try 4.0 before uninstalling 3.6?

Want to install v4.0 as a separate instance without losing v3.6.

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 profile 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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James j,
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See [[Plugin crash reports]] and [[The adobe Flash plugin has crashed]]. If you need more help you should [[ask a question|ask a new question]] (start a new thread).

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== User Agent ==
Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/4.0; GTB6.4; FNGP_SYS)

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I have an article for you that can help you go through that process of uninstalling and reinstalling iTunes. If you have Windows 7, you will want to see this article:
Removing and reinstalling iTunes, QuickTime, and other software components for Windows Vista or Windows 7
http://support.apple.com/kb/ht1923
and if you are using Windows XP, you will want to reference this article:
Removing and Reinstalling iTunes, QuickTime, and other software components for Windows XP
http://support.apple.com/kb/ht1925
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iTunes Store purchases or songs imported from CDs are saved in your My Music folder by default and are not deleted by removing iTunes. While it is highly unlikely that you will lose any contents of your iTunes Library when following these steps, it is always a good idea to ensure that your iTunes library is backed up. If you're unsure how to backup, see iTunes: Back up your iTunes library by copying to an external hard drive.
Thanks for using the Apple Support Communities. Have a good one!
-Braden

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