every time I add a new bookmark one of the previous ones disappear
There seems to be a finite limit to the number of bookmarks as it seems that every time I add 1, 1 disappears. The bookmarks do not show up anywhere I can find, even in "Show all Bookmarks". Any idea of the limit?
Alla svar (5)
Before you lose any more data, please do this:
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
Mozilla search: Import {web link}
You aren't looking in one the smart bookmarks folders like "Recently Bookmarked" that only show a list of bookmarks?
Can you find all the bookmarks in the Bookmarks Manager (Library) or bookmarks sidebar?
As to the bookmarks you may have lost:
http://kb.mozillazine.org/Unable_to_process_the_backup_file_-_Firefox
jscher2000 has a tool on his website to extract out your bookmarks and save them to an HTML-format bookmark export file. If you want to try it, here is the page:
https://www.jeffersonscher.com/res/bookbackreader.html
To open the bookmarkbackups folder in Finder, use the "Open in Finder" button in the first table on the Troubleshooting Information page, and double-click into bookmarkbackups where you should see several dated files. From there you can drag and drop onto the conversion tool.
To import the HTML file, see the steps in this article: Import Bookmarks from an HTML file.
[v57+] Places Maintenance is built into Firefox.
Type about:support<enter> in the address bar.
You will find Places Database near the bottom. Press the Verify Integrity button.
When done, copy and post the results here.
If you haven't discovered the optional bookmarks menu button -- 
-- you might want to install it. Either:
(A) Use the Customize panel (Customize Firefox controls, buttons and toolbars) to drag the icon to the desired spot on the toolbar
(B) Use the method from Bookmarks in Firefox - section entitled: How do I add the Bookmarks Menu button to the toolbar?
- Click the "Library" button:
- Click "Bookmarks"
- Click "Bookmarking Tools"
- Click "Add Bookmarks Menu to Toolbar"