In fact, the failure with my greasemonkey script turned out to also be an adverse interaction with the unity add-on. Disabling that has allowed my script to work again. So this seems to be a bug in unity- firefox-extension.
** Also affects: unity-firefox-extension (Ubuntu) Importance: Undecided Status: New -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1426581 Title: with greasemonkey in firefox 36, "Error: Exposing privileged or cross- origin callable is prohibited" To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/1426581/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs