Unfortunately, that's the way it's working. I would suggest using Iceweasel via Easy Debians, it's faster (sic!), and You can use microB to Your "daily" browsing, and Iceweasel, when power of addons is needed. With proper configuration - i.e. emulated right and middle clicks, + ED on dedicated partition, using Iceweasel is very pleasant. Except long starting time, which is no such a big deal.

(In case someone may still don't know, Iceweasel = de-branded firefox on Debian)