MozBackup continues to perform very well considering that it hasn't been updated in like forever. I just used it today for one of my occasional backup of Thunderbird and Firefox. There is also a little known backup program that I have been experimenting with. It is called Hekasoft Backup and Restore. Not only does it backup Mozilla programs, it also backs up Google Chrome, Cyberfox, Pale Moon, and others.
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www.hekasoft.it/hekasoft ··· restore/NOTE: Read the fine print there that says this...
Choosing this download you will support Hekasoft, and you will have the opportunity to install additional third-party software.
If you like to download the version without third-party software you can download the software from this link.
And then click on link at the end of the sentence and get the program from there.