The configuration directories of FF and TB are located in the user's home directory and can be easily located and backed up with a simple tar command

• Firefox: .mozilla directory
• Thunderbird: .thunderbird directory

Warning! These directories are hidden and may use a lot of disk space! You may want to check how much they are using from time to time, if you are a bit short on space: cd; du -sh .mozilla .thunderbird
If need be, you can move these directories by roughly following the steps described for Windows

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