hello don, you have a user.js file in your profile that might be overwriting your privacy preference - for details on how to resolve that please refer to How to fix preferences that won't save

Start Firefox in Safe Mode to check if one of the extensions (Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem.

• Switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance
• Do NOT click the Reset button on the Safe Mode start window

• https://support.mozilla.org/kb/Safe+Mode
• https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes

Note that clearing "Site Preferences" clears all exceptions for cookies, images, pop-up windows, software installation, passwords, and other website specific data.

• privacy.clearOnShutdown.offlineApps: True
• privacy.clearOnShutdown.passwords: True
• privacy.clearOnShutdown.siteSettings: True

Phillip,

Thanks for your response. I deleted two lines from user.js:

user_pref("app.update.disable_button.showUpdateHistory", true); user_pref("browser.history_expire_days.mirror", 180);

I also found an extension that may have been the cause with one of its options. I'll let you know if this has fixed the problem.

Regards,

Don

Cor-el,

Thanks for your response. I'm trying some things first. If the don't work, I'll try your suggestions.

Regards,

Don

An user.js file shouldn't be there unless you created it yourself.

What other user_pref() lines are in that file?

Phillip,

The changes did not work. On launching today, Firefox again has changed my preference to deleting all history on exit.

Don

I've excluded the lines for printing:

user_pref("accessibility.typeaheadfind.flashBar", 0); user_pref("app.update.auto", true); user_pref("app.update.disable_button.showUpdateHistory", true); user_pref("app.update.enabled", true); user_pref("app.update.lastUpdateTime.addon-background-update-timer", 1225638583); user_pref("app.update.lastUpdateTime.background-update-timer", 1225637983); user_pref("app.update.lastUpdateTime.blocklist-background-update-timer", 1225637983); user_pref("app.update.lastUpdateTime.microsummary-generator-update-timer", 1225560746); user_pref("app.update.lastUpdateTime.search-engine-update-timer", 1225668550); user_pref("browser.download.dir", "/home/don/Documents/fin/Ken Drake"); user_pref("browser.download.lastDir", "/home/don/Desktop/Favorites/Calligraphy-Marbling"); user_pref("browser.download.useDownloadDir", false); user_pref("browser.feeds.handler.default", "bookmarks"); user_pref("browser.feeds.showFirstRunUI", false); user_pref("browser.history_expire_days.mirror", 180); user_pref("browser.migration.version", 1); user_pref("browser.places.importBookmarksHTML", false); user_pref("browser.places.importDefaults", false); user_pref("browser.places.leftPaneFolderId", -1); user_pref("browser.places.migratePostDataAnnotations", false); user_pref("browser.places.smartBookmarksVersion", 1); user_pref("browser.places.updateRecentTagsUri", false); user_pref("browser.preferences.advanced.selectedTabIndex", 2); user_pref("browser.startup.homepage", "http://www.detnews.com/apps/pbcs.dll/frontpage"); user_pref("browser.startup.page", 3); user_pref("browser.tabs.forceHide", false); user_pref("extensions.enabledItems", "ubufox@ubuntu.com:0.5,langpack-en-GB@xulrunner-1.9.ubuntu.com:1.9.0.3,{972ce4c6-7e08-4474-a285-3208198ce6fd}:2.0"); user_pref("extensions.lastAppVersion", "3.0.3"); user_pref("extensions.update.notifyUser", false); user_pref("font.minimum-size.x-western", 12); user_pref("font.size.variable.x-western", 10); user_pref("general.smoothScroll", true); user_pref("intl.charsetmenu.browser.cache", "windows-1252, ISO-8859-15, Shift_JIS, ISO-8859-1, UTF-8"); user_pref("network.cookie.prefsMigrated", true); user_pref("pref.advanced.images.disable_button.view_image", false); user_pref("pref.advanced.javascript.disable_button.advanced", false); user_pref("pref.browser.homepage.disable_button.current_page", false); user_pref("pref.privacy.disable_button.view_cookies", false); . . . user_pref("privacy.sanitize.sanitizeOnShutdown", true); user_pref("security.disable_button.openCertManager", false); user_pref("security.warn_entering_secure", false); user_pref("security.warn_leaving_secure", false); user_pref("security.warn_submit_insecure", false); user_pref("security.warn_viewing_mixed", false); user_pref("spellchecker.dictionary", "en_US"); user_pref("urlclassifier.keyupdatetime.https://sb-ssl.google.com/safebrowsing/newkey", 1227547685); user_pref("urlclassifier.tableversion.goog-black-enchash", "1.62474"); user_pref("urlclassifier.tableversion.goog-black-url", "1.25401"); user_pref("urlclassifier.tableversion.goog-white-domain", "1.481"); user_pref("urlclassifier.tableversion.goog-white-url", "1.371");

Does this help?

please try renaming/deleting the whole user.js file

Are you sure that this is the content of the user.js file because this looks like a prefs.js file?

If it is a user.js file then you may have renamed the file by accident and you need to remove this file.

Phillip, Cor-el,

Thanks for your help. Deleting user.js looks to have cured the problem. I notice that it has not been replaced. I have no idea how it was created as I had never heard of either of these files before this thread.

Thanks again,

Don