Show Only Modified Preferences on About:Config in Firefox
configure specific setting (about:config) | Opera forums
Show Only Modified Preferences on About:Config in Firefox
About:config - MozillaZine Knowledge Base
How To Optimize Firefox By Tweaking Hidden Settings In The "about:config" Page
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Most useful Mozilla Firefox about:config tweaks
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
Tip] How to Restore Old About:Config Page in Mozilla Firefox – AskVG