What is it you want to do? There are many add-ons that can help.

On the about:config page, any settings that have changed from the default setting are listed in Bold type.

Go to the Mozilla Add-ons Web Page {web link} (There’s a lot of good stuff here) and search for what you want.

I tried your suggestions earlier but the list in bold is very very long and it is very difficult for me to associate the wanted option and the parameter in about:config. For example browser.cache.disk.capacity set to 0 changes the Cached Web Content?

http://kb.mozillazine.org/Browser.cache.disk.capacity

Use this link to search for about:config settings; http://kb.mozillazine.org/Knowledge_Base

Easiest is to start with the default settings and make a change in the user interface to modify a setting. Then check on the about:config page if a pref was changed. You can click the Status header to sort by this column (locked, user set, default). Note that not all settings might be stored in a pref (e.g. the crash reporter). You can disable the disk cache if you do not want to use it (filter for cache on the about:config page).

• browser.cache.disk.enable

For clearing history there are two sets ("Clear Recent History" and "Clear history when Firefox closes").

• privacy.cpd.*
• privacy.clearOnShutdown.*
• privacy.sanitize.sanitizeOnShutdown

Cookies: network.cookie.*

Firefox Health Report:

• datareporting.*
• datareporting.healthreport.*
• datareporting.healthreport.service.enabled [21+]
• datareporting.healthreport.uploadEnabled [21+]

I use these to prevent creating extra prefs:

lockPref("datareporting.sessions.current.main", 0);
lockPref("datareporting.sessions.currentIndex", 0);
defaultPref("datareporting.healthreport.uploadEnabled", false);
defaultPref("datareporting.policy.dataSubmissionEnabled", false);
defaultPref("datareporting.healthreport.service.enabled", false);

See also:

• http://kb.mozillazine.org/Mozilla_Crash_Reporter (Can I disable Crash Reporter?)
• http://kb.mozillazine.org/network.proxy.type (Related preferences)

You can read the comments in the source code.

• http://mxr.mozilla.org/mozilla-release/source/modules/libpref/init/all.js
• http://mxr.mozilla.org/mozilla-release/source/browser/app/profile/firefox.js
• http://mxr.mozilla.org/mozilla-release/source/netwerk/base/security-prefs.js
• http://mxr.mozilla.org/mozilla-release/source/toolkit/components/telemetry/docs/preferences.rst

Thanks to everybody. Cor-el your suggestion is useful but takes time and patience, I think that a table with firefox options and relative values on about:config page will be very useful for users.

In a lot of cases you can use the DOM Inspector to check what attributes are present for a specific setting to see if there is one that shows the involved pref.

• DOM Inspector: https://addons.mozilla.org/firefox/addon/dom-inspector-6622/

• https://developer.mozilla.org/DOM_Inspector
• https://developer.mozilla.org/Introduction_to_DOM_Inspector

See also:

• Element Inspector: https://addons.mozilla.org/firefox/addon/element-inspector/