If you got a new PC or laptop, you could easily move your Firefox profile data to your new computer. All you need is to copy and paste profile directory files to the new computer.
There are tools to backup and restore the profile data, or synchronize your profile among different devices but you can to do it manually if what you need is to permanently move your profile data to the new PC.
Where is My Firefox Profile Folder?
First, let’s find where your Firefox profile data is.
The location of Firefox profile folder in Windows XP or Windows 2000:
“C:\Documents and Settings\{username}\Application Data\Mozilla\Firefox\Profiles”
Or if you are using Windows Vista, Windows 7 or 8, you can find it here;
“C:\Users\{username}\AppData\Roaming\Mozilla\Firefox\Profiles”
Don’t forget to change the “username” with your windows username.
You will find a directory in the format of “XXXXXXXX.default”, which is your Firefox profile folder. XXXXXXXX is a random string of 8 characters.
If you can’t locate your profile folder, check out this link for a more detailed explanation.
Copy Your Profile Data
Now, copy the directory, “XXXXXXXX.default”, to a flash drive, dropbox, google drive or wherever you could access it from your new computer.
Paste Your Profile Data
Go to the directory where your firefox profile exists on your new PC.
Double click to browse your “XXXXXXXX.default” on your new PC. Delete all the contents of this directory.
Paste the contents of the profile directory from your previous PC to this directory
You should be able to see all the bookmarks, extensions, themes, passwords, preferences, cookies from your last machine on your new PC.