Firefox will: Use custom settings for history + "Always use private browsing mode". In that case, you may see old history from regular windows that is "read only." Otherwise, you should be able to delete history unless there is a database problem which prevents updates.
To recover bookmarks that were previously saved in the Bookmarks menu or on the Bookmarks toolbar but are now missing, you can restore them from one of these backups: Click the menu button to open the menu panel. Click Bookmarks and then click the Manage bookmarks bar at the bottom. In the Library window, click the Import and Backup button and

Browsing history. The URLs of sites you've visited, and the dates and times of each visit. On your device (or, if sync is turned on, across your synced devices) Download history. The list of files you've downloaded from the web. This only deletes the list, not the actual files that you've downloaded. On your device. Cookies and other site data

First, open Firefox on your iPhone, iPad, and Android device and tap the menu icon in the address bar. Select "Settings" from the menu. Scroll down and select "Data Management" on iPhone/iPad or "Delete Browsing Data" on Android. Select "Cache" or "Cached Images and Files," then tap the "Clear Private Data" button on iPhone/iPad or "Delete
Click on the hamburger menu at the top right, and select History. Click on Clear recent history. Make sure to select Browsing & download history and Form & search history. If you would like to clear Cache, Cookies, and Active logins, you can select those as well.
Type about:config in the address bar and press Enter Return. A warning page may appear. Click Accept the Risk and Continue to go to the about:config page.; In the Search preference name box at the top type browser.sessionstore.resume_from_crash.; Click the Toggle button next to browser.sessionstore.resume_from_crash to set it to false.; Troubleshooting Previous session not correctly closed
Install the Addon here by clicking Add to Firefox button. Launch Firefox and click on History cleaner. Click Manage Extensions from the drop-down menu. Go to Options on the left side of the page
Step 3. Download and install an index.dat file reader onto your computer if you don't already have one. Open the index.dat file within the reader. Click on the history you would like to restore to select it. Click the "Restore" button to restore your selections. Open your Firefox browser to check the restored history.
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    • firefox can t delete history