Review for Gmail Manager by coyoteelabs
Rated 5 out of 5 stars
While waiting for an official add-on, you can enable the current version to work with 3.6 with the following steps:
1. ignore version check to get the download button
2. save link as to save the xpi file instead of installing it
3. unzip it
4. edit install.rdf (notepad or other text editor) and change the info within like so:
from 0.5.7.5 change it to 0.5.7.6
then lower, just after the comment, change 3.5.* to 3.6.*
5. insert the updated install.rdf back in the xpi file (zip archive)
6. drag & drop the xpi file in firefox window
7. install
To create your own collections, you must have a Mozilla Add-ons account.