From MozillaZine Knowledge Base
Firefox 2.0 integrates spell checking in form controls. When a user right-clicks in a field with spell checking enabled, â€œDictionariesâ€ appears in the context menu with an option to download dictionaries. This preference determines the URL loaded when that item is clicked.
Possible values and their effects
A string representing the URL to visit where the user can download dictionaries for the spell checker. Default value is â€œhttps://%LOCALE%.add-ons.mozilla.com/%LOCALE%/firefox/%VERSION%/dictionaries/â€. (
First checked in
Has an effect in