Welcome to Firefox for Android Add-ons.
Add extra features and styles to make Firefox for Android your own.
CloseReview for Gmail Manager by Belinou
Rated 5 out of 5 stars
0.6.3 is working well for me.
Download and install it by drag & drop in Firefox. It is not linked on the website but the release file exists:
http://www.longfocus.com/firefox/gmanager/releases/gmanager063.xpi
To create your own collections, you must have a Mozilla Add-ons account.