Bookmarks in firefox, set during a session, are lost once the session is closed. The next session shows no bookmark.
First close all firefox browsers open in the system. If the open firefox browsers are not closed,
this solution will not work.
Go to the .mozilla directory under home directory.
cd ~/.mozilla
Somewhere here, there is a file named prefs.js with a key to our problem. Find this file.
find . -name prefs.js -print
Open this file using a text editor. Go to the line in this file saying,
user_pref("browser.places.importBookmarksHTML", true);
Change true to false. That is,
user_pref("browser.places.importBookmarksHTML", false);
Save the file. Start firefox browser.