ESTING ***
    *
    * If the URL bar starts with <b>file://</b>, Firefox may not load the font used
    * to display the special characters used in the On-Screen Keyboard.
    *
    * To work around this Firefox bug, navigate to <b>about:config</b>
    * and set <b>security.fileuri.strict_origin_policy</b> to <b>false</b>
    * while testing.
    *
    * Firefox resolves website-based CSS URI references correctly without needing
    * any configuration change, so this change should only be made for file-ba