The suggestion (for example).
Does it disable the userscript when downgrading Firefox too?
The minimal version has to be checked before every start - changing in the file scriptMatchesUrlAndRuns.js. The user can also change the Metadata Block!
Anticipate greasemonkey/greasemonkey#1726 and greasemonkey/greasemonk…
Oops... I'm sorry.
Looks a little bit like some discussion in JasonBarnabe/greasyfork#30
But I'd prefer a more general syntax as metioned there, so the keyword is the same for every engine supporting it.
Style clean up