To try the thousands of add-ons available here, download Mozilla Firefox, a fast, free way to surf the Web!
CloseWelcome to Firefox Add-ons.
Choose from thousands of extra features and styles to make Firefox your own.
CloseReviews for Theme Font & Size Changer (fixed) by marcus80-PL
Rated 5 out of 5 stars
We're waiting still for the new version of the extension TB 68.2.1
Rated 5 out of 5 stars
Please update to new thunderbird 68
To create your own collections, you must have a Mozilla Add-ons account.