the problem happened with some versions when i update firefox web browser. after i update, for examble from version 87 to 88 ,the history worked fine for a day or less then the history consisted of some of my bookmarks and the last 15 or 20 websites i visited , for some older versions when this problem happend the history was blank. I tried to reinstall firefox, tried some older versions and the beta version also and the problem stands. i also deleted the places.sqlite and the related files so i sync again and it worked also for a day or so and glitched again.