These instructions should give you what you want;

Open the Bookmarks Manager; Press the Alt or F10 key to bring up the toolbar, and select Bookmarks. Hot key is <Control> (Mac=<Command>) <Shift> B.

Once the window is open, at the top of the page, press the button labeled Import and Backup. Select Export Bookmarks To HTML, and follow the prompts and save it to a HTML file. Copy the file to another computer/profile. Repeat the instructions above, BUT select Import Bookmarks From HTML.

https://support.mozilla.org/en-US/kb/restore-bookmarks-from-backup-or-move-them

https://support.mozilla.org/en-US/kb/recover-lost-or-missing-bookmarks

Importing bookmarks from "bookmarks.html" does not import the description field into Bookmark Notes.

Bookmark Notes is a separate plugin.

How do I import the Firefox Bookmarks description field into Bookmark Notes?

Hello henryw763,

Would you please take a look at this :

https://www.ghacks.net/2018/09/11/restore-bookmark-descriptions-in-firefox-with-bookmark-notes/

If that doesn't help, maybe you could ask the developer of the extension :

https://addons.mozilla.org/en-US/firefox/addon/bookmark-notes/

henryw763 said

Importing bookmarks from "bookmarks.html" does not import the description field into Bookmark Notes.

Exactly what steps did you follow? This is what worked for me:

(A) Install Bookmark Notes

(B) Go to the Add-ons page and click its "More" Link

Either:

• Ctrl+Shift+a (Mac: Command+Shift+a)
• "3-bar" menu button (or Tools menu) > Add-ons
• type or paste about:addons in the address bar and press Enter/Return

In the left column of the Add-ons page, click Extensions.

Then find Bookmarks Notes on the right side and click either Options or More. (Screenshot attached.)

(C) Configure Import options

Scroll to the bottom of the page and the bottom of the Options section to find the import settings. (Screenshot attached.)

Use the Browse button to load your bookmarks.html file. Then if the file structure is valid, the Import button should be enabled.