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!

backup Thunderbird profile (still works with Windows 11)

If you want to move your Thunderbird mails from one computer to another, take the following steps:

• on the old Windows 7 or Windows 10 computer go to %APPDATA% and copy the Thunderbird folder (including a Profiles folder and the file profiles.ini) to an external disk drive.
• on the new Windows 7 or Windows 10 computer, go to the folder %APPDATA%\Thunderbird or create it respectively. (That should be something like C:\Users\YOURUSER\AppData\Roaming\Thunderbird)
• copy profiles.ini from your old Thunderbird folder to the new one.
• copy the old Thunderbird folder to a directory of your choice (e.g. C:\Mail\)
• open %APPDATA%\Thunderbird\profiles.ini in an editor and change the path name under Path to match the location of the profile in your Profiles folder.
• When using an absolute path, change isRelative from „1“ to „0“ and use backslashes for the path! For a relative path use slashes.
• example:

[General]
StartWithLastProfile=1

[Profile0]
Name=default
IsRelative=0
Path=C:\Mail\Thunderbird\Profiles\3yd2397e.default