Review for CategoryManager by Firefox user d7370b
Rated 5 out of 5 stars
For what it is, is perfect.
But I had some misshaps when selecting a contact categories, since if a write a email, it does not automatically writes from the account that the categories came from, so I have to check every time if the email account is right.
To create your own collections, you must have a Mozilla Add-ons account.