Doesn't the End key do that in your browser?

Should be Ctrl-End. End goes to the end of the line (scrolling to the right, if necessary). This has been standard across all applications for even longer than Ctrl-X, Ctrl-C, Ctrl-V for clipboard operations. (Back in the DOS days, paste was Shift-Insert for example in many apps, but even then all the cursor keys (home, end, pgup, pgdn, and the arrows, any of these with Ctrl and/or Shift) did exactly the same thing in all major applications, which has not changed to this day. (I still use these regularly in OpenOffice, mozilla, ... anything with a text widget, really.) The only major app I know that doesn't observe these is Emacs, which has its own even older (and, incidentally, quite horrible) tradition for the default key bindings. (Fortunately, it's easy enough to change the bindings around, which I have done.)

$;=sub{$/};@;=map{my($a,$b)=($_,$;);$;=sub{$a.$b->()}}
split//,".rekcah lreP rehtona tsuJ";$\=$ ;->();print$/
[download]