I have not found a single website that it cannot do, including google blogger and boostmobile.
I have tried all Android browsers including Opera, Dolphin, Skyfire and many other unknown ones, none of them can log into boostmobile account.
It supports add-on like Adblock+.
This article is done entirely with Firefox on Samsung Galaxy Tab 7, incliding screen captured photo inserting/uploading. But for everyday browsing, Opera is still the one - this firefox is too bulky and buggy, taking up at least 20MB space.