Bookmarklet code broken in Firefox

The `javascript:!function () { … }();` format is not compatible with Firefox. I propose switching to `javascript:(function () { … }());`. (I'm referring to the Bookmarklet code displayed in the README.)

If a `javascript:!function…` bookmarklet is executed in Firefox, its code is loaded and executed inside the address bar, which in turn kills the current page. I guess, this is due to the code evaluating to `true`, unlike `javascript:(function…` which evaluates to `undefined`.

Note: This could be Windows-specific. Test here: http://jsfiddle.net/tot41ndo/ (drag into Bookmarks bar to test)