Try to Profile Manager - Create, remove or switch Firefox profiles In the options you can select "Don't ask at startup" (If you have multiple profiles, Firefox prompts you for the profile to use each time you start Firefox. Select this option to allow Firefox to load the selected profile without prompting at startup.

To access other profiles after selecting this option, you must start the Profile Manager first.

Hi, I forgot to mention that every time I click on a link it pops up an pop-up windows saying something like,

"You have to end the currently running process of Firefox or that the process is not answering right now. You have to terminate the already running process to open a new window".

Thanks...

See "Firefox is already running but is not responding" error - How to fix

Generally speaking, Firefox can only run in one profile at a time. By default, Firefox will simply keep re-using the last profile you used until you change the default by starting up in a different profile using the Profile Manager. (Shortcuts that start Firefox with a particular profile do not, as far as I know, change your current default profile.)

Does that fit your style of working or do you need to run more than one profile at once? There is a way to do that (the -no-remote switch), but links from external programs would keep spawning new instances of Firefox rather than sharing an existing session, which would not be an efficient use of memory...

First, have separate desktop shortcuts for each of those Profiles, to avoid having to use the Profile Manager all the time.
http://kb.mozillazine.org/Profile_Manager#Shortcut_to_a_specific_profile

2nd, external links will only open the Default=1 Profile as labeled in the profiles.ini file.
http://kb.mozillazine.org/Profiles.ini_file
No way around that without changing the "default" Profile all the time.

3rd, it is possible to launch a 2nd simultaneous Profile without getting that "running process" message by using the -no-remote command in the desktop shortcut target path, like before or after the "Profile_Name". But doing that with the default Profile can be unpredictable when being opened from an external link.

And the -no-remote command that I just mentioned isn't sanctioned by Mozilla for non-developer type users, which is one reason why I provided links to a non-official KnowledgeBase. The official 'line' is - "We do not wish to expose the profile at all. It's supposed to be a hidden implementation detail" from one of the Mozilla lead developers.

You guys are awesome and rock!

I finally solved it with your help!  :-)

THANKS!

See also:

• https://developer.mozilla.org/en/Mozilla/Multiple_Firefox_Profiles