Show Only Modified Preferences on About:Config in Firefox
Customize Privacy Settings in Mozilla Firefox: Part 1 (about:config) | WebDevelopmentAid
Tip] How to Access Hidden Secret “About:Config” Editor Page in Mozilla Thunderbird – AskVG
How to Use the Firefox about:config Option browser.download.folderList
v.68 about:config settings could be altered to allow local testing; v.69 seems to have more and different settings to change: can you advise please? | Firefox Support Forum | Mozilla Support
Need help with some about:config settings | Firefox Support Forum | Mozilla Support
Re-enabling SSL 3.0 support in Firefox after RHSA-2014:1919 - Red Hat Customer Portal