Bug 828184 - Block qipcap.dll version 7.6.815.1 and earlier for a topcrash related to an interface change of nsIPrefBranch, r=ehsan a=bajaj

--HG--
extra : transplant_source : lS2%EE4%D4%5E%BDT1%3B6%96%020%F4%0C%C3%8B%DE