One Tab addon adds item to the context menu. Menu filter hide this item, but after firefox restart, "One Tab" item reappears. It seems that One Tab loads after Menu Filter.
Having similar issue here with the Evernote Web Clipper. No option to even hide that context menu item. Very annoying, but possibly not an issue with Menu Filter — hard to say.
One Tab addon adds item to the context menu. Menu filter hide this item, but after firefox restart, "One Tab" item reappears. It seems that One Tab loads after Menu Filter.