Can I have two versions of firefox at the same time?

Hi,
Probably a dumb question but can I have two versions of Firefox on my system at the same time?
The reason is because of Add Ons that are not compatible with v4. I'd like to be able to close v4 when I need to use an Add On in v3.
Thanks.

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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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)

Have been up for 2 days trying to have two versions of Firefox on the same machine because Princeton Review only supports 2.0 and my laptop upgraded me to 4.o can you please help?

When I try to access the interactive sites on Princeton Review I politely receive this message:
Your browser: Firefox 4.0 WinNT | JavaScript supported: Yes | screen size: 1366 X 768 | Flash Version Installed: 10.0 r42 | Supports AJAX:Yes | Click here to test connection speed
Attention:
'''This browser is not supported. '''Links to Start, Resume or Start Over any exams in iTest are disabled for this browser.
'''''We encourage you to use''''' Microsoft Internet Explorer 6.0 or higher or '''''Mozilla Firefox 1.5 or 2. '''''
''Use of your Online Student Center in Firefox 3.0 is not yet supported.''

IMO, you are better off installing - [http://sourceforge.net/projects/portableapps/files/Mozilla%20Firefox%2C%20P.E.%20Legacy/Mozilla%20Firefox%2C%20Portable%20Edition%202.0.0.20%20Repack/FirefoxPortableLegacy20_2.0.0.20_English.paf.exe/download Firefox Portable 2.0.0.20] - to your hard drive for the few web sites that are so out of date that they don't support newer versions of Firefox. That way you don't need to fool around with a separate Profile for 2.0.0.20, and there is less chance of a another version / Profile of Firefox getting "contaminated" by that old version or you losing private data if your get the Profiles switched.

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Alright, so I decided to install the Firefox 4 beta 3 as a test sort of thing. But now it's set as the default browser, and, no matter what I do, I can't switch back to the old one! I can't use any of my old add-ons now!

If you are want to test pre-release versions of Fiefox it is best to use a different profile for each version, and then create shortcuts to launch Firefox using the correct profile for each version. Firefox store user data in profiles, pre-release versions of Firefox can make changes to the profile that cause it not to work in older versions of Firefox.
Some articles that can help you from the MozillaZine knowledge base:
* [http://kb.mozillazine.org/Creating_a_new_Firefox_profile_on_Windows Creating a new Firefox profile on Windows]
* [http://kb.mozillazine.org/Shortcut_to_a_specific_profile Shortcut to a specific profile]
* [http://kb.mozillazine.org/Starting_your_Mozilla_application_with_a_specified_profile Starting your Mozilla application with a specified profile]
Some further background reading:
* [http://kb.mozillazine.org/Testing_pre-release_versions Testing pre-release versions]
* [http://kb.mozillazine.org/Using_multiple_profiles_-_Firefox Using multiple profiles]

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Can I have two versions of firefox? i.e. one for work and one for home use. I use Windows xp
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tracktor wrote:
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Can you have two different itunes account on the same computer

how can you have 2 different itunes accounts on the same computer?

You would need two seperate users on the computer. Then each library would be independent of each other. Or do you mean two seperate iTunes store accounts?

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Can I have two versions of firefox at the same time?

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