As a variant. You can try to save bookmarks of different profiles in the html files. Then export in firefox and edit manually. Read more here:https://support.mozilla.org/en-US/kb/profiles-where-firefox-stores-user-data.

Just a note about the difference between these two things:

• "export" and "import" use an ancient HTML document format that all browsers can understand. When you import bookmarks, Firefox may place them into an Imported Bookmarks folder, or into Unsorted Bookmarks. This does not displace existing bookmarks, and Firefox does not automatically remove duplicates.

• "backup" and "restore" use a more comprehensive JSON data file, which contains extra information about your bookmarks (such as tags) not contained in the traditional export file. HOWEVER, a restore completely replaces all existing bookmarks, so the restore feature cannot be used to merge in a set of additional bookmarks.

Related support articles:

• Export Firefox bookmarks to an HTML file to back up or transfer bookmarks
• Import Bookmarks from an HTML file
• Restore bookmarks from backup or move them to another computer

Some users find the disk-based Windows Favorites folder a convenient way to organize bookmarks. If you do, too, and you do not need to preserve tags on your bookmarks, you could export each profile's bookmarks to HTML and import them all into IE11. Organize them in the Windows Favorites folder, then export from IE11 to HTML and import that file into each Firefox profile. See: http://windows.microsoft.com/en-us/in.../add-view-organize-favorites.

If I was more familiar with the Firefox Sync service, I might be able to suggest how to do this using Sync, but I'm nervous that something might get lost in the process.

You can have multiple Firefox instances open at the same time and then use a copy and paste to copy selected bookmarks (Bookmarks menu, Bookmarks Sidebar or Library) from one instance and paste them in the Library of another instance. I do that all the time with bookmarklets because that is safest (an HTML backup don't always work properly in case of bookmarklets). This also works with copying between different Firefox versions and I've done this with Firefox 3.6 and Firefox 31 or later versions.

You can add -no-remote to the command line to open another Firefox instance with its own profile and run multiple Firefox instances simultaneously.

• http://kb.mozillazine.org/Opening_a_new_instance_of_Firefox_with_another_profile

• https://developer.mozilla.org/Mozilla/Multiple_Firefox_Profiles