minor fix

* update comments
update preset for redirect URL

* update URL for '2ch'
* remove items; unused 'Hatena antenna' and closed service 'My Opera'
fetch only required value from module
tidy up constants of UI elements
adjust check state of menuitem for editor option

* three menuitems corresponding to editor options are added in Fx31;
  see https://bugzilla.mozilla.org/show_bug.cgi?id=953206
Fx33: add TODO comment for IME key names

* https://bugzilla.mozilla.org/show_bug.cgi?id=1024864