Running multiple Firefox instances with different profiles

You can run multiple firefox instances simultaneously using different profiles using the command:

C:\Program Files\Mozilla Firefox\firefox.exe -ProfileManager -no-remote

This helps you if you want to login to the same website with different user ids at the same time. If you will want to do this frequently, you can modify your Quick Launch shortcut as follows:

1) Right click on your Quick Launch shortcut for Firefox and click "Properties".
2) In the Target field, append -ProfileManager -no-remote so that it now reads similar to the command line above.
3) Click OK.