I have no idea how channels work or how they differ from hashtags... This is a good topic for the FAQ.

Thanks for the kind words. I wish the custom protocol API was more flexible so that I could add just "ssb:" as the protocol, the fact that I need to add it as "ext+ssb:" annoys the hell out of me. I will talk at the add-ons developer channels at Mozilla to see if they can change this API but I don't expect them to care much about my request, such niche cases.

About the extension, I think that maybe with ssb-ooo and some nice layouting, it become really useful. I also plan to add a view full thread link to the message.