Add the "types" parameter to the .registerProvider() call.
Add the "types" parameter to the .registerProvider() call.

Firefox 6 requires this; we keep our XUL overlay and don't pass most of the optional parameters, to maintain compatibility with 4 and 5.

Fixes #1357

HasClass0/greasemonkey,HasClass0/greasemonkey,Ventero/greasemonkey,the8472/greasemonkey,Ventero/greasemonkey,the8472/greasemonkey,Martii/greasemonkey,Martii/greasemonkey