The bookmarks and history system will not be functional" error message has been dogging me for several months. System is windows 11 home and Firefox version 151. All updates are current across windows and FF. I noticed on the about support page that FF shows that this is a NT Windows 10 OS, not Windows 11. Not sure what that means. I have followed all of the suggested fixes, multiple times. Some don't work at all and some work for a short period of time before the error message returns. The only fix that works the longest is to reinstall FF. This then requires the time consuming task of updating my settings, extensions, proxy, etc. When the next round of Windows security and / or FF updates come through the error message returns. Reluctantly getting ready to dump FF. This is my last ditch effort to find a solution. Thanks.