Loss of sync settings between sessions
On one laptop I use frequently I usually lose my sync settings between Firefox sessions. I have to re-login to Firefox, log out, then log back in - and they recover. There must be something (spyware monitor?) doing it because it doesn't happen on other laptops or desktops I use. Any suggestions (it's surmountable but annoying).
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You may have ad/mal-ware. Further information can be found in this article; https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-caused-malware?cache=no
Run most or all of the listed malware scanners. Each works differently. If one program misses something, another may pick it up.
Your ‘logged-in’ status is stored in special cookies. If the cookie is removed, you are logged out.
You may be in Private Browsing mode or told Firefox not to remember.
Type about:preferences#privacy<enter> in the address bar. The button next to History, select Use Custom Settings.
Turn off Always Use Private Browsing Mode Turn on Remember My Browsing And Download History At the bottom of the page, turn on Clear History When Firefox Closes. At the far right, press the Settings button. Turn on ONLY Cache and Form And Search History leaving the others off.