User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:18.104.22.168) Gecko/20070713 Firefox/22.214.171.124 Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:126.96.36.199) Gecko/20070713 Firefox/188.8.131.52 The Firefox popup blocker is disabled each time Firefox is closed. I have to check it each time I open Firefox or popups are not blocked. Reproducible: Always Steps to Reproduce: 1.Exit Firefox. 2. 3.
See http://kb.mozillazine.org/Preferences_not_saved for possible solutions.
Ria Klaassen sent me a link to an article about losing preferences in Mozilla and how to fix it. One of the possibilities mentioned worked for me. I deleted the file user.js from the Profile folder, and am now able to exit Firefox without the popup blocker being disabled. Thank you!