I just installed release 40 of Firefox. I was presented with my extension screen showing many addons as "unsigned". I did a little research, not knowing what this meant, and found out with the next release that addons that are not "signed" will be disabled. One of these addons was Toolbar Buttons. I also use TB to create custom extensions for myself (urls etc.). What, if any, is the plan to get "signed"? I am sorry as this appears to cause people a lot of extra work for an undetermined payback.