Dear sproulpat, I refer you to the link https://support.mozilla.org/en-US/kb/bookmarks-firefox. see if the solution to your problem is there, otherwise just ask.

I looked there first per protocol. (It only saves a bookmark in the last folder you save it to; undoubtedly to prevent people from accidentally saving to multiple folders. But I want it saved in 2 or more folders sometimes/often.)

If you click the highlighted star on the location/address bar then you edit an already saved bookmark, so you can't use that to have a copy of this bookmark in a different folder.

You can drag the tab to specific bookmarks folders to have multiple copies of a bookmark. In the Bookmarks Manager (Library) you can do this via a Copy/Paste of an existing bookmark and paste the bookmark in a different folder.

• https://support.mozilla.org/en-US/kb/sort-bookmarks-quickly-find-ones-you-want