> Task: checkIntegrity
+ The places.sqlite database is sane
+ The favicons.sqlite database is sane
> Task: checkCoherence
+ The database is coherent
> Task: expire
+ Database cleaned up

Sorry to hear about this problem. Firefox is having problems working with your "Places" database file(s). That is the source of the error message you mentioned in your question ("The bookmarks and history system will not be functional"). ''Initial question: was this a standard install of Firefox from Mozilla's website, or are you using the version from the Microsoft store? They store their files in different places.'' First thing to try is simply exiting out of Firefox and starting it up again. Do you still get the extra toolbar with the error message in the title of the following article: [[Fix "The bookmarks and history system will not be functional" error message]]? If you see that bar, Firefox either can't get access to the file -- possibly another process has locked it -- or the file has become corrupted. Before giving up on the file and nuking it (as described in that article), you could try a few other things: '''(1) Try to release the file if it's locked''' I found a post describing how to use Windows' Resource Monitor to try to figure out what program has opened a "handle" on the file (filter by ''places''): https://superuser.com/a/643312 If it won't release, try a normal shutdown and/or restart of your system. If CCleaner normally runs at startup, see whether you can cancel that or create an exception for Firefox files. '''(2) Run the "Verify Integrity" diagnosis and repair function''' That's here: Open Firefox's Troubleshooting Information page using any of these methods: * "3-bar" menu button > Help > More Troubleshooting Information * (menu bar) Help > More Troubleshooting Information * type or paste '''about:support''' in the address bar and press Enter Near the bottom, there is a section titled '''Places Database''' -- that's the file which stores history and bookmarks. Click the button labeled '''Verify Integrity'''. There may be a 10-15 second delay before results appear. If all is well, the report that appears below the button should start with: > Task: checkIntegrity + The places.sqlite database is sane + The favicons.sqlite database is sane > Task: checkCoherence + The database is coherent > Task: expire + Database cleaned up ''et cetera'' Does yours say the databases are sane and coherent, or something else? You can select and copy the report, and then paste it into a reply for review and comment.