Even if a picture is worth 1000's of words. I must provide some info about my installation. I am monitoring this multi language spellcheck in the context menu since its inception, since I proposed it. The three languages displayed are installed, and so is the French language pack. I use the French language generic .tar file and it is installed in /opt. Prior to FF 135, this setting never functioned properly. It required several attempts to register the additional selection of English. Something is blocking it and cannot be seen. But, when I close FF and restart, the selection appears.