Move Firefox profile from one computer to another

• Install Firefox on the new computer.
• Copy the profile folder from one computer to another. You can find and manage the profile location by using the profile manager (starting Firefox with the -p option, i.e. firefox -p) or by typing about:profiles in a firefox tab.
• Create the profile you wish to use on the new computer’s Firefox with the profile manager and select the copied profile folder.
• If you use multiple Firefox profiles,
  • repeat the above process for each profile.
  • copy your Firefox folder (e.g. c:\Program Files\Mozilla Firefox). I name them after the profile name I use, e.g. c:\Program Files\Mozilla Firefox Facebook).
  • create a link in the taskbar for each Firefox instance and add -no-remote -p "profile name" (e.g. profile name would be Facebook in the above example) to the shortcut.
  • start the Firefox profile using the created link. Now you will see that the Firefox icon appears twice in the taskbar.
  • unpin the link you used to start Firefox.
  • pin the the link to the taskbar of the started Firefox.
  • Open %APPDATA%\Microsoft\Internet Explorer\Quick Launch\User Pinned\TaskBar in the Windows Explorer. Add -no-remote -p "profile name" to the link again. Change the icon if you want different icons for each Firefox profile in you taskbar.
  • If you don’t see the new icon right away, restart the Windows Explorer or wait for the next reboot.

After a tedious process, you are done!

change firefox taskbar icon

For Firefox 21 and newer:

• Go to C:\Program Files (x86)\Mozilla Firefox Facebook\browser
• create the following folders:
• chrome\icons\default
• Put your icon into the default folder and name it main-window.ico

To avoid that your firefox icon is shown twice in the taskbar:

• start firefox
• unpin firefox‘ old item
• pin the started firefox to the taskbar

To create multiple firefox profiles (e.g. to exclusively use one firefox instance with facebook):

• type: firefox -p to open a profile editor.
• create a new profile named facebook, for example
• press shift and right-click the firefox item in the taskbar and select properties.
• add -no-remote -p facebook after the shortcut

PAC files under Firefox and Windows 7

Firefox uses IPv6 addresses while PAC files are often configured using IPv4 addresses. If there are problems, it may help to set network.dns.disableIPv6 to true in about:config.