Welcome to Firefox for Android Add-ons.
Add extra features and styles to make Firefox for Android your own.
CloseReview for xSidebar for Thunderbird by Atavachron
Rated 5 out of 5 stars
This STILL works, even up to version 11.0 of Thunderbird, but you will need to edit the maxversion to read 11.* in the install.rdf file which is inside the XPI (addon) file. It can be opened as a .ZIP file.
The addon is quite nice, and immediately gives you an address sidebar and an addons sidebar without having to add anything additional.
To create your own collections, you must have a Mozilla Add-ons account.