There are a lot of settings in about:config, but I don't know what they do, and I haven't found information about them from Mozilla's website. I hope that some documentation should be detailed enough to include every setting item
Hello
Take a look https://forums.mozillazine.org/viewtopic.php?p=14960439#p14960439Example https://searchfox.org/mozilla-release/source/modules/libpref/init/all.js
This makes the matched text stand out when findbar highlighting is on.pref("ui.textHighlightBackground", "#ef0fff");
An illustration https://connect.mozilla.org/t5/ideas/increased-visibility-for-current-quot-find-in-page-quot-match/i...
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Similar idea here: Make about:config user friendly (i.e. with a graphic UI and/or an explanation of each setting)
never-displayed