This commits Default network.http.sendRefererHeader to 0.
"network.http.sendRefererHeader" is a configuration option for
the Firefox web browser; it accepts an integer. Determines when
to send the Referer HTTP header.
- 0: Never send the referring URL
- 1: Send only on clicked links
- 2: Send for links and images
http://kb.mozillazine.org/Network.http.sendRefererHeader
This commit would allow overriding prefs
(locked or otherwise) with a user accessible file even
on sandboxed/restricted releases (like AppImage or Flatpak).
This works because the last specific pref value that is parsed
during startup is the one that gets actually applied; this way
an empty / non existing overrides file will not have any effect,
and only prefs changed in this file will be changed, while other
prefs from the `librewolf.cfg` will still be applied.
The difference to a `user.js` is that at this stage / with this
file, even locked prefs can still be modified.
Should we desire to have some prefs _really_ locked down (which we
do not want to be changeable with this override method), we could
just place them after the changes from this MR - so they would be
parsed after those defined in the overrides file and could override
pref changes made there.
Somewhat related to #45, #27; should partially fix#8 and basically
mitigate the recurring issues of users unable to edit some locked
settings when using a more restricted release variant.
Should probably be added to the docs, once merged.
