Same mistake made here Streaks, about that ALT-S thingy when using FireFox, checkout AutoHotkey. You can define your own hotkeys and specify what that combo is to within different programs. (I have a couple of handy ones to automate spammer-slaying ) Another option is to use an add-on to FireFox (keyconfig comes to mind), this would allow you to remap some predefined key combinations. Avast is decent enough. I have it on 2 PCs at home already for years and none of them are infected (yet).