simple-modify-headers 1.8.1 can't add, change or remove parts of URL!
simple-modify-headers 1.8.1 can't use parts of URL in many places...
simple-modify-headers 1.8.1 can't replace or remove parts of URL in many places...

This header works better than the older referrer control but it's missing an easy to add option to add site to be blocked. In Referrer Control it was a context menu to add it so did not even need the extension to even show on the toolbar. This one requires always showing on toolbar as I could not other way to start it and manually typing in to add a site to it.

Easily a 5 star if the convenience to add a site is much easier and quicker as well as not have to display more on an already crowded toolbar. Give and option menu in the Firefox add-ons page and give option not to delete all previous rules if you import a config in.