Use different profiles with different versions of Firefox

I want to use 2 versions of firefox (27 and AURORA) on my mac. IS there any way I can PERMANENTLY 'assign' profiles to the exact versions so one version ALWAYS opens with profile1, the other- with profile2?
Please explain clearly.
Thanks.

You will have to make specific shortcuts to open a Firefox instance with a specific profile by adding -P "profile name" to the command line to launch Firefox. If no profile is specified then the profile that is selected as the last used profile in the Profile Manager will be used. It is not possible to select another profile automatically if another profile is already being used. You will have to click the correct desktop shortcut to select a specific profile.

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i used the old one fine for years. How do i make the new one open or how do I get the old one back

Firefox 4 requires at least OS X 10.5. You can get the latest version of Firefox 3.6 from http://www.mozilla.com/en-US/firefox/all-older.html
Mozilla are working to prevent Mac users with non-compatible systems from getting the notification about Firefox 4, and also not displaying the "Download Firefox 4" button on http://www.mozilla.com

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Hi Mark,
See http://kb.mozillazine.org/Using_Google_Toolbar_features_without_toolbars
If you have an aspect that is not covered, indicate what that is; otherwise, expect you to be fully functional within 1-2 weeks.
 Please mark "Solved" one answer that will best help others with a similar problem -- hope this was it.

How to use two different versions of Firefox at the same time on Snow Leopard?

I recently upgraded to Firefox 4.0 on my 27" iMac running Snow Leopard 10.6.7.
Previously, I was using Google's "Page Speed" along with Firebug in Firefox 3.6.15 to optimize images in my web pages, and to find other areas to optimize.
Page Speed is not yet compatible with Firefox 4.0. I wrote to Google about this some time ago -- no answer yet.
If I run Firefox 3.6.15 in order to use Page Speed, I run into a few problems afterward when I start using Firefox 4.0 again, since they both use the same "Firefox" folder in my "Application Support" folder.
How can I set it up so that I can have two separate "Firefox" folders in my "Application Support" folder?
Or is there an easier way to use two different versions of Firefox simultaneously, even if one has extensions and/or plug-ins installed which are not compatible with the other version?
Thanks for a great browser!

Please disregard my question. I just conducted more web search and learned how to use Firefox's profile manager in order to make a separate profile for Firefox 3.6.15.
You can find instructions on this page:
http://support.mozilla.com/en-US/kb/Managing%20profiles#os=mac&browser=fx35
'''A small tip:'''
If your Firefox app is named anything other than "Firefox" -- say for example "Firefox 3.6.15" -- when you follow the instructions at the above link, make sure you escape the blank space that is before the version number by adding a backward slash before it, when you type the command string in the Terminal. In other words, in that string, you should use this:
Firefox\ 3.6.15
I hope that helps someone.
WW

Firefox Sync on same computer with different versions of Firefox

Hi,
I know how to use Sync on two different computers and a mobile device, but how can I Sync two or more different versions of Firefox (Nightly, Beta, Aurora, Release Candidate)? I can't get the code from the other computer/firefox because I can only have one version of Firefox open at the same time. I tried it. This is my setup. I have a different Profile for each version of Firefox I have. I also have each version of Firefox installed in a different directory, for example:
Nightly - C:\Program Files\Mozilla Firefox\Nightly\
Aurora - C:\Program Files\Mozilla Firefox\Aurora\
Beta - C:\Program Files\Mozilla Firefox\Beta\
Release Candidate - C:\Program Files\Mozilla Firefox\Release Candidate\
and my Profiles are in my
Nightly - C:\Users\David\AppData\Roaming\Mozilla\Firefox\Profiles\David-Nightly\
Aurora - C:\Users\David\AppData\Roaming\Mozilla\Firefox\Profiles\David-Aurora\
Beta - C:\Users\David\AppData\Roaming\Mozilla\Firefox\Profiles\David-Beta\
Release Candidate - C:\Users\David\AppData\Roaming\Mozilla\Firefox\Profiles\David-Release Candidate\
and I run Firefox with the following command (Properties/Target)
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"C:\Program Files\Mozilla Firefox\Nightly\firefox.exe" -P "David-Beta"
"C:\Program Files\Mozilla Firefox\Nightly\firefox.exe" -P "David-Release Candidate"
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Thank You.

Use the -no-remote command line switch to open another Firefox instance with its own profile and to run different Firefox instances simultaneously, but do not use -no-remote with the default browser and the default profile.
* http://kb.mozillazine.org/Opening_a_new_instance_of_Firefox_with_another_profile
Enter all details like the account name (email address) and password and the 26-character Sync key manually to connect to an existing sync account instead of using the 12-character code to pair a device if pairing isn't possible.
# open "Tools > Options > Sync" or "Firefox > Set Up Sync"
# click "Set Up Firefox Sync" to go to "Firefox Sync Setup"
# click "I Have an Account" : Connect
# click "I don't have the device with me" at the bottom to enter the account settings (email, password, sync key)
# click the "Sync Options" button at the bottom to select what to sync (Sync Options only affect the first sync)

I need a different version of Firefox for work. 4.0 isn't working correctly with my work program and I don't know how to download an older version.

I have an online job that requires me to use a different version of firefox. My computer already has 4.0 on it and I need to know how to change it to an older version so I can use it for work.

http://support.mozilla.com/en-US/kb/Installing+a+previous+version+of+Firefox
http://www.mozilla.com/en-US/firefox/all-older.html

I just downloaded Aurora, but I hear that using it along with another version could damage my profile?

I have a desktop computer and a laptop. I have installed Firefox 4 on both, but today I decided to install Aurora on the desktop computer and I plan on installing Nightly on my laptop. My plan is to use the newer versions as my default browsers and resort to Firefox 4 if a site isn't working. I have Sync set up to sync everything across the two computers.
I have read on multiple websites that since each version uses the same profile, very bad things could happen to that profile if you use different versions on the same machine.
Is this true for my situation? Would my bookmarks or passwords or anything be lost or damaged? Will Sync sync my information to all of the different versions?
For example, is it ok to run Nightly on my laptop and Aurora on my desktop and use Firefox 4 when needed and have Sync sync my passwords and other information?
I hope this makes sense. Thank you for your help!

Thank you cor-el for those links! I have decided that I do not want to run Nightly anymore after reading that it could destroy my profile information or crash my computer.
Honestly, do you think Aurora will cause any damage to my profile if I use it with my day-to-day profile that contains all of my important information? Keep in mind I would be using Aurora on both computers that are set up to synchronize and then using Firefox 4 if ever needed. I've been running the betas for Firefox 4 and also using 3.6 when needed with my normal profile and there was never any corruption, so why would that happen with Aurora? Wouldn't Mozilla warn us? I do not want to set Aurora up to use a different profile. If that is dangerous, I will uninstall it and just use betas and final releases across my machines. But I would love to test the newest features and provide suggestions for improvement, but I need to use my same profile.
What do you suggest I do?
Thank you!

Using XP Professional SP 3 with latestest version of Firefox, the US Airways web site will not work properly. I can still make it work with MS IE

I am using XP Professional SP 3 with newest version of Firefox, the US Airways web site does not work. I can make the site work with MS Internet Exp. What do I need to change to make Firefox work?

Can you clarify in which way the site isn't working?
Can you attach a screenshot?
*http://en.wikipedia.org/wiki/Screenshot
*https://support.mozilla.org/kb/how-do-i-create-screenshot-my-problem
Use a compressed image type like PNG or JPG to save the screenshot.
Create a new profile as a test to check if your current profile is causing the problems.
See "Basic Troubleshooting: Make a new profile":
*https://support.mozilla.org/kb/Basic+Troubleshooting#w_8-make-a-new-profile
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I can't use Yahoo messenger (it doesn't open the dialogue window), but in other PCs with older versions of Firefox I don't have problems
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Also I am not able to open a new dialogue window or tab by clicking on an online contact of mine.

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*http://kb.mozillazine.org/Cookies

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Use different profiles with different versions of Firefox

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