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.
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.