In case you are using "Clear history when Firefox closes":

• do not clear the Browsing History

• Tools > Options > Privacy > Firefox will: "Use custom settings for history": [X] "Clear history when Firefox closes" > Settings
• https://support.mozilla.org/kb/remove-recent-browsing-search-and-download-history

Note that clearing "Site Preferences" clears all exceptions for cookies, images, pop-up windows, software installation, passwords, and other website specific data.

Thanks for that.

What happened was this: I looked today at my history (people had been borrowing my computer). I saw a long list of things for "yesterday" and was even able to click on a few to get a better idea of what they were.

I later came back to do that again and the library only had "today" available. I cannot find yesterday or "7 days ago" or anything older. Where did it go? How can I see it again?

Did you follow the instructions above?

Problems with bookmarks and history not working properly can be caused by a corrupted places.sqlite database file.

Open a new tab or window. type about:support in the address box and press enter. Or Press the Alt or F10 key to bring up the tool bar. Then Help > Troubleshooting Information.

Under the page logo on the left side you will see Application Basics. Under this find Profile Folder. To it’s right press the button Show Folder. This will open your file browser to the current Firefox profile. Now Close Firefox.

Locate the file. Then rename or delete it. Restart Firefox.