Hidden configuration pages offer more settings in Chrome, Firefox
Config.json settings - Terraria Wiki
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
Adjusting Firefox settings to enhance your online privacy | Privacy International
How to Use the Firefox about:config Option browser.download.folderList
Tip] How to Restore Old About:Config Page in Mozilla Firefox – AskVG
10 Cool Firefox Hidden Settings You Should Check Out | Beebom
configure specific setting (about:config) | Opera forums
Configuration Editor for Firefox | Firefox Help
Firefox 71 release to get new About:config Page
How to change or reset an advanced setting in Firefox
Show Only Modified Preferences on About:Config in Firefox