l.26 of UpWiz/resources/mw.FormDataTransport.js compares two strings. This makes the condition true for my current Firefox version ("17.0" < "7.0" === true) so, a more resource insensitive method is used instead of the native FormData()
This is not the intended behaviour; "this.gecko" should be only true for Firefox versions lower than 7.0 (https://bugzilla.mozilla.org/show_bug.cgi?id=649150).
To fix the issues, it needs to
- eliminate the use of deprecated $.browser
- when comparing versions, compare them as numbers