Try exporting the bookmarks again to an HTML file. Open the file in a text viewer. Does it look okay? Then try importing the new file.

I did as you advised; The file looked good but the import function still doesn't work.

I called for more help. Please explain the problem in detail. What happens? What is/are the exact error message(s) ?

Can you confirm that this is an HTML backup and not a JSON backup ? An HTML backup starts with: <b><nowiki><!DOCTYPE NETSCAPE-Bookmark-file-1></nowiki></b> A JSON backup starts with: <b><nowiki>{"title":"","id":1,"dateAdded":</nowiki></b> Are there bookmarks with very long names or URLs in the file that might be causing problems ? ----- You can check for issues caused by a corrupted <b>places.sqlite</b> or <b>favicons.sqlite</b> databases in the Firefox profile folder. *use "Verify Integrity" button on the "Help -> Troubleshooting Information" (about:support) page If errors are reported with "Verify Integrity", close and restart Firefox or reboot the computer and retry. If "Verify Integrity" cannot repair places.sqlite, rename/remove all <b>places.sqlite</b> and <b>favicons.sqlite</b> files in the Firefox profile folder with Firefox closed. Firefox will rebuild places.sqlite and restore the bookmarks from a recent JSON backup in the bookmarkbackups folder. *keep a backup copy of places.sqlite in case a new places.sqlite database has to be created See also: *https://support.mozilla.org/en-US/kb/Bookmarks+not+saved#w_fix-the-bookmarks-file *https://support.mozilla.org/en-US/kb/fix-bookmarks-and-history-will-not-be-functional You can use the button on the "Help -> Troubleshooting Information" (about:support) page to go to the current Firefox profile folder or use the <b>about:profiles</b> page. *Help -> Troubleshooting Information -> Profile Folder/Directory:<br>Windows: Open Folder; Linux: Open Directory; Mac: Show in Finder *https://support.mozilla.org/en-US/kb/profiles-where-firefox-stores-user-data