what does “Support: Firefox 18+” mean in jQuery1.9.1 source code?

what does “Support: Firefox 18+” mean in jQuery1.9.1 source code?

I'm reading jquery1.9.1 source code. At the beginning, it says:

  1. // Can't do this because several apps including ASP.NET trace 
  2. // the stack via arguments.caller.callee and Firefox dies if 
  3. // you try to trace through "use strict" call chains. (#13335) 
  4. // Support: Firefox 18+ //"use strict";
I've read ticket #13335 saying because of apps like ASP.NET trace call stack via arguments.caller.callee, "use strict" was removed.

but I don't understand what "Support: Firefox 18+" means?

Does it mean, if you use firefox 18+, "use strict" will work fine with apps like ASP.NET?