That's why IceCat (formerly Ice Weasel) exists.
Formerly? I use IceWeasel all the time, and I didn't know about this. Oh, wait:
The gNewSense BurningDog browser and the Debian IceWeasel browser are similarly derived from Firefox, also with the intent of being free software. Technically, however, these projects are maintained entirely independently of IceCat. (Previously, this GNU browser project was also named IceWeasel, but that proved confusing.)
Yeah, you know, that is pretty darned confusing, since I think that if you ask 100 slashdot users about IceWeasel, at least 99 would be thinking of the widely-distributed Debian software that originated the name...