To organize your bookmarks in alphabetical order in Firefox, you can follow these steps: 1. Open the Bookmarks Library

   Open Firefox.
   Click on the Bookmarks menu in the toolbar. If you don’t see the toolbar, you can access bookmarks by clicking on the menu button (three horizontal lines) in the upper right corner and selecting "Bookmarks."
   Select "Manage Bookmarks" (or press Ctrl + Shift + B on Windows or Cmd + Shift + B on Mac) to open the Bookmarks Library.

2. Sort Bookmarks

   In the Bookmarks Library, you will see a list of your bookmarks and folders.
   To sort bookmarks within a specific folder:
       Click on the folder you want to sort.
       In the right pane, you will see the bookmarks listed.
       Right-click on an empty space in the bookmarks list and select "Sort by Name." This will arrange the bookmarks in that folder in alphabetical order.

3. Sort All Bookmarks

If you want to sort all bookmarks in the library:

   In the Bookmarks Library, click on "All Bookmarks" in the left sidebar.
   Right-click on the "Bookmarks Menu" or any other folder you want to sort.
   Select "Sort by Name." This will sort all bookmarks in that folder alphabetically.

4. Close the Bookmarks Library

Once you have sorted your bookmarks, you can close the Bookmarks Library by clicking the "X" in the upper right corner or simply closing the tab. Additional Tips

   If you have a lot of bookmarks, consider organizing them into folders to make it easier to find specific bookmarks.
   You can create new folders by right-clicking in the left sidebar of the Bookmarks Library and selecting "New Folder."

This did not work for me, my os is Linux Mint, I don't know if that makes any difference