the profile
Hello, My profile often loses all the history, and in particular the identifiers, it is this known problem, I copy the saved profile: % AppData \ Roaming \ Mozilla \ Firefox \ Profiles \ 1575xi32.default-1,444,993,107,763 to 1,549,813,872,225
Chosen solution
What about the rest of your profile? Any problems? Can you add/remove bookmarks?
[v57+] Places Maintenance is built into Firefox.
Type about:support<enter> in the address bar.
You will find Places Database near the bottom. Press the Verify Integrity button.
When done, copy and post the results here.
https://support.mozilla.org/en-US/kb/how-to-fix-preferences-wont-save
Note: Some software, like Advanced SystemCare with Surfing Protection, can protect files in the Firefox profile folder against changes. If you have such software then check the settings or uninstall this software.
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Chosen Solution
What about the rest of your profile? Any problems? Can you add/remove bookmarks?
[v57+] Places Maintenance is built into Firefox.
Type about:support<enter> in the address bar.
You will find Places Database near the bottom. Press the Verify Integrity button.
When done, copy and post the results here.
https://support.mozilla.org/en-US/kb/how-to-fix-preferences-wont-save
Note: Some software, like Advanced SystemCare with Surfing Protection, can protect files in the Firefox profile folder against changes. If you have such software then check the settings or uninstall this software.