From MozillaZine Knowledge Base
In Firefox 3, the built-in help viewer was removed. The â€œHelp → Help Contentsâ€ menu item and pressing [F1] now direct the user to online help instead. This preference determines which URL to visit for help.
Possible values and their effects
The URL to visit when a user triggers the built-in help function. Default value is https://support.mozilla.com/1/%APP%/%VERSION%/%OS%/%LOCALE%/, where
First checked in
Has an effect in