I use normal firefox, but I would simplify my life. One method, not so many. I have so many email accounts.
I will investigate is exist an addon for TB.
I use TB in portable way, and firefox installed in system (and under xp I have six system under xp, so I was using a common configuration for firefox located in a data disk...)
I suppose that the rss feeds are similar to the old news from OE, so may be exist something for TB.