Compatibility fixes for edit toolbar:

Compatibility fixes for edit toolbar:
* Use infobox mode for Gecko. Inline direct editing is neat, but because of
  a Mozilla bug that induces weird scrolling it's confusing and unusable.
  When Mozilla fixes the bug and we can detect it, we'll enable it for
  fixed versions only.
* Use 'new RegExp()' instead of '//' to avoid ugly JS parse errors when
  viewing pages in Netscape 3. There are still runtime errors in NS3 at
  edit time, but this lets people read in peace.