cck.config.preferences

Browser preferences (about:config settings). (JSON)

List of browser preferences, located in about:config:
http://kb.mozillazine.org/About:config_entries

Must be in single-line "minified" JSON format. See example at bottom.

NOTE! If this policy is defined here, all inherited "browser preferences" from a parent policy are lost. To keep all settings from an inherited policy, combine/merge the individual browser preferences from the parent policy into this policy. For example, if you are adding one new preference here and a parent policy already has three other preferences that you want to retain, define this policy with all four preferences in it.

Below is an example of multi-line JSON settings. See conversion details below.

{
"browser.reader.detectedFirstArticle": {"value": true},
"pdfjs.enabled": {"value": true}
}

Below is an example of the above settings converted to single-line "minified" format and prefixed with "JSON:". This format is required for this policy setting.

JSON:{"browser.reader.detectedFirstArticle":{"value":true},"pdfjs.enabled":{"value":true}}

You can use various JSON-formatting websites for validation and conversion, such as:
http://codebeautify.org/jsonviewer

cck.config.preferences

Registry Hive	HKEY_LOCAL_MACHINE
Registry Path	Software\Policies\Mozilla\Firefox
Value Name	cck.config.preferences
Value Type	REG_SZ
Default Value