From MozillaZine Knowledge Base

  • The caveats seems to be outdated:

> "This preference can only be changed by editing channel-prefs.js in the application directory."

At least on FF3.5, about:config can be used to change this setting which immediately reflects in pref.js --Andig 13:41, 30 June 2009 (UTC)

Did you verify that the user_pref() value is actually used? It is my understanding that it is simply ignored and therefore you have to set the original pref() value in channel-prefs.js, but that may have changed. --Rsx11m 23:23, 1 July 2009 (UTC)
I don't think we should redirect this "Category:Preferences" article to Software Update#Update_channels_-_Advanced if that's what you meant. (See for background about preferences articles in general.) Also, 1) Software Update#Update_channels_-_Advanced includes an link to this article and 2) I could be wrong but, afaik we can't redirect an article to a specific section of another article (it will just go to the top of the article). I think we should simply add a "See also" link to Software Update#Update_channels_-_Advanced to the end of this article. --Alice 12:04, 2 October 2015 (UTC)
I just added a "See also" link to Software Update#Update_channels_-_Advanced --Alice 12:09, 2 October 2015 (UTC)