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<pre><i>Locking duplicate thread. Please continue here: [[/questions/971178]] </i></pre> I'm constructing preconfigured Firefox 23.0.1 installation under Win 7 64-bit using browser\defaults\preferences\prefs.js file. Yes, I know that it should be called all-*companyname*.js, but it works in general in my way too. As I have written in subj, when I add to prefs.js file 'pref("privacy.sanitize.sanitizeOnShutdown", true);' line, then lines 'pref("privacy.clearOnShutdown.cookies", true);' and 'pref("privacy.cpd.cookies", true);' stop working. If one run about:config immediately after installation, she would see that the latter two options are switched to false and marked **bold** (changed by user). I had tested it heavily: if one comment out 'pref("privacy.sanitize.sanitizeOnShutdown", true);' line other two preferences work just fine. On the other hand if one add this cursed pref either upper or lower in code - no matter - it would turn both other preferences to *false*. The question is where these strange side-effects are documented? And how can be made a preconfigured installation that possible both sanitize things and clear cookie data on closing? Thanks in advance.