Add-ons
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.
CloseReview for Proton Calendar Toolbar Button by Gatowalker
Rated 5 out of 5 stars
A great and easy solution to work with the original Proton Calendar in Thunderbird... love it.
To create your own collections, you must have a Mozilla Add-ons account.
