Captain Happy, one way to merge bookmarks is to export each alternative profile's set to a html file, and then within the main profile import those htmls. This should add the alternative html bookmarks to the main profile, without removing the pre-existing set. Note I would also export the main profile's bookmarks before importing the others, to have a backup in case something goes wrong. And after importing one file, it might be worth moving the newly imported bookmarks into their own named folder, before importing the next set. Just so that you can keep track of where each bookmark came from, and to avoid any possible name / folder conflicts. ---- In case you weren't already aware: to export to / import from a html file, go to the bookmarks library (on Windows press ctrl+shift+O) and choose the appropriate option under the "Import and Backup" menu at the top. To open or delete other profiles, enter "about:profiles" into the address bar to open the manager, and then press the appropriate button under the profile.