FF mobile: enable/disable via menu

[hpvd]

extension works really great, but in some case one wants to see a page in all it's colours... for this: in ff mobile it would be pretty handy to have a menu entry:

if bandwidth hero is on: "disable usage of bandwidth hero and reload page with standard behaviour (colour images)" -> short "bh: disable & reload"

and if bandwidth hero is off: "enable bandwidth hero starting with next page load" -> short "bh: enable for next page"