Welcome to Firefox for Android Add-ons.
Add extra features and styles to make Firefox for Android your own.
CloseDeveloper reply by Jonathan Protzenko
Rated 2 out of 5 stars
It does not group very well, for me.
I have threads with the same subject with 2 people going back and forth, and they do not get grouped.
I suggest you read https://github.com/protz/GMail-Conversation-View/wiki/What-is-threading
To create your own collections, you must have a Mozilla Add-ons account.