OK, well as I said you are welcome to find the equivalent extension for your browser of choice. I’m just sharing what happens to have worked for me. I’m sure there are plenty of other ways to go about it. I’m perfectly happy which what I’ve managed to put together, so I didn’t feel the need to search further.
I have always consumed the forum via email. I get an email for every new topic and I can use the email filters to sort or exclude things. When I am interested in a topic, I’ll load just that forum page alone, then if I have some thing to add to the discussion I’ll comment and if I only want to follow the conversation I’ll configure it for watching so I’ll get another email for every comment.
In this manner, I avoid the need for using a large portion of the UI of the forum. You might find you can do the same with your RSS feeds.