You're welcome; I created this because I missed it too. The API provides no way to control placement in the menu (https://bugzilla.mozilla.org/show_bug.cgi?id=1325758). Closest thing to a hotkey that would be workable is an access key (the underlined letter you see in default context menu items). As of Firefox 63, extensions may set an access key. In BTH 0.5, 'h' can be used as an access key. Version 0.5 is currently in beta; check the first post in the support forum, or wait for the release version.