HI, having such a out of date browser 43.3.0 that is more than several years old is hard to say why you lost all your bookmarks and history (Chonik). Current version is of Firefox is 59.0.2 Please check here to see if you have a 2nd Profile made and that your old one may still be there : *https://support.mozilla.org/en-US/kb/profiles-where-firefox-stores-user-data If there is a folder on your Desktop called OldFirefoxData (I do not what year that started in) as your data may be there and recoverable also. Please uninstall your Flash 10 as it is a magnitude of security issues. Flash Player Version: 29.0.0.140 Current Version https://get.adobe.com/flashplayer/otherversions/ Step 1: Select Operating System Step 2: Select A Version (Firefox, . . . .) Please let us know if this solved your issue or if need further assistance.

Verify that you meet the System Requirements (GTK+ and GLib) for current Firefox releases. *https://www.mozilla.org/en-US/firefox/59.0.2/system-requirements/ *https://www.mozilla.org/en-US/firefox/52.7.3/system-requirements/