[Companion] Menu-button fix

[Brian]

Miles Libbey wrote:

>There appear to be some bugs that folks think have fixed
>http://mozdev.org/bugs/show_bug.cgi?id=6954 has suggested code in it
>  
>
I have a new version of MenuItem that fixes this more 
generically.  Any
protocol should be accepted in a bookmark.

>http://mozdev.org/bugs/show_bug.cgi?id=4783 doesnt really have a
>proposed fix, just points to a specific code problem
>  
>
I don't see this one, so it may be fixed.

>http://mozdev.org/bugs/show_bug.cgi?id=5179 has a patch attached to it,
>but since it was done in feb, its not clear if its already in.
>  
>
This one is fixed by the earlier changes to MenuItem.