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CloseReview for Theme Font & Size Changer for ThunderBird by Another Dave
Rated 1 out of 5 stars
The directory for Linux is:
/home/Username/.thunderbird/xxxxxxx.default
And add the chrome sub-directory to that. This may also work on iOS.
Where can I find a list of entries like font-size and font-family?
To create your own collections, you must have a Mozilla Add-ons account.