Yesterday everything on my machine was working hunky dory; IE, Chrome, FF, Steam, Thunderbird, iTunes etc...
Today I've booted up, and Firefox won't load any pages; it gets stuck at "connecting" for any URL I try. Chrome works fine, and IE only worked after I disabled & reinstated Malwarebytes Anti-Exploit & Avast's shield. Steam, iTunes, Thunderbird etc... are all working.
I've tried a full reset of FF, tried system and no proxy, clear the cache completely, but it just won't play ball. I can't even hit my router page. I've also disabled IPv6 DNS as per the Mozilla advice, but still no dice.
Malwarebytes full system scan says I'm clean, as does Avast.