Is there an official manual in detail for the Firefox option?
For example, I want to know the detail about the option permissions.default.image and I can not find it in Mozilla's homepage support.mozilla.org (just only FAQs).
Is there an official manual in detail for the Firefox option?
Ausgewählte Lösung
Many of them are documented briefly in the source code, in case the Mozillazine listing is not up-to-date.
Many but not all are in this file:
https://dxr.mozilla.org/mozilla-release/source/modules/libpref/init/all.js
Use Ctrl+f Find to search for the preference name in the page, unless you want to search across all source files in the release (slow), for which there is a search bar near the top of the page.
In this case:
http://kb.mozillazine.org/Permissions.default.image
vs.
pref("permissions.default.image", 1); // 1-Accept, 2-Deny, 3-dontAcceptForeign
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MozillaZine has a page listing the various about:config options. Here's a link to it. That list isn't exhaustive, but it also links to a category listing even more about:config options.
Regarding the specific setting you mention as an example, there is some additional information available about it on the MozillaZine page talking about it.
As far as I know that's the closest to a manual detailing all the advanced options.
I hope that helps :-)
Ausgewählte Lösung
Many of them are documented briefly in the source code, in case the Mozillazine listing is not up-to-date.
Many but not all are in this file:
https://dxr.mozilla.org/mozilla-release/source/modules/libpref/init/all.js
Use Ctrl+f Find to search for the preference name in the page, unless you want to search across all source files in the release (slow), for which there is a search bar near the top of the page.
In this case:
http://kb.mozillazine.org/Permissions.default.image
vs.
pref("permissions.default.image", 1); // 1-Accept, 2-Deny, 3-dontAcceptForeign