This is what he said in russian- The browser version is the latest, Win 10. Of the add-ons, only AdGuard (optional irritant filter I don't care about cookies)

Every 3-4 days, it throws it out of the Google account.

What could be the reason?

Detail like websites remembering you and log you in automatically is stored in a cookie.

You can use these steps to make a website recognize and remember you:

• create a cookie allow exception with the proper protocol (https:// or http://) to make a website remember you

You can check that you aren't clearing important cookies.

• using "Delete cookies and site data when Firefox is closed" keeps cookies with an allow exception
• using "Clear history when Firefox closes" to clear cookies clears all cookies including cookies with an allow exception you may want to keep
• clearing "Site Preferences" clears exceptions for cookies, images, pop-up windows, and software installation and exceptions for passwords and other website specific data

• Options/Preferences -> Privacy & Security
  Cookies and Site Data: "Manage Exceptions/Permissions"

All this i know, and already setted up. But the same problem every week. It's logging out me from accounts

Here is my settings

Looks that you use "Never Remember History" (будет запоминать историю) and that means you are in permanent Private Browsing mode (Always use Private Browsing mode; Never Remember History). In PB mode all data is kept in memory and cookies expire automatically when you close Firefox.

Make sure you do not run Firefox in permanent Private Browsing mode (Always use Private Browsing mode; Never Remember History).

• https://support.mozilla.org/en-US/kb/private-browsing-use-firefox-without-history
• https://support.mozilla.org/en-US/kb/common-myths-about-private-browsing

• Options/Preferences -> Privacy & Security
  Firefox will: "Use custom settings for history"
• remove checkmark: [ ] "Always use Private Browsing mode"

No, i have "Will remember history" (Будет запоминать историю)

And today again: And, not only from google account, but mozilla (this forum) also

Help please... hot to fix it? how to stop it? Which settings should i check?

cor-el told you all there is... try it with no adguard maybe. i cant read those settings in your picture, i use a translator for text. try re-install firefox or try an add-on for saving cookies. that is all the tips i have

Firefox 82+ comes with a "Redirect Tracking Protection" feature to purge tracking cookies for websites that haven't been visited recently automatically. You can disable the feature to purge tracking cookies automatically via the about:config page.

• privacy.purge_trackers.enabled = false

You can open the about:config page via the location/address bar. You can click the button to "Accept the Risk and Continue".

• https://support.mozilla.org/en-US/kb/about-config-editor-firefox

I just disable AdGuard... will se if this is the reason.

just use ublock origins bro, that is all you need.

Its still the same... With adguard\ublock... or withous this both addons...

Its continue to loggin-out every 2-3 days...

I think, that it is a browser doing. Because, I use adblocks for a years... But this problem i notifed month or more