Having the macOS Help button in a scrolling view feels kind of weird, but that's
what Apple is doing in the Ventura System Settings app, so I guess we go with
it. I like it better than Firefox's non-contextual "Firefox Support" button
under the pane list in their preferences, anyway - having pane-by-pane
contextual help buttons seems like good UX that there isn't a good reason for us
to ditch.
The XBL prefwindow bindings are removed in Firefox 60, so this adds them
back, along with necessary styling, to allow the existing preferences to
work until the preferences are rewritten with React. The preferences.xml
file in the Mozilla source has platform ifdefs, but since this is a
temporary hack I've just duplicated the file for each platform with the
necessary lines included.
I haven't yet tested the styling on Windows/Linux.
