profiles: firefox: add new ~/.config/mozilla dir (#7061)

Default directories in Firefox 146 and earlier:

* ~/.cache/mozilla  # cache files
* ~/.mozilla        # config and data

In Firefox 147[1]:

* ~/.cache/mozilla  # cache files
* ~/.config/mozilla # config and data

Note that the new location apparently contains the same files as in the
former location (including settings, bookmarks, extensions, etc).
That is, even though the new directory resides in `$XDG_CONFIG_HOME` /
~/.config, it is not solely used for program configuration as described
in the XDG Base Directory specification[2] and `$XDG_DATA_HOME` /
~/.local/share/mozilla is seemingly not used at all (see also the
discussion in the bug tracker[3]).

Commands used to search and replace:

    $ perl -pi -e 's/(.* )(\${HOME}\/\.mozilla)(.*)/$1\${HOME}\/.config\/mozilla$3\n$1$2$3/' \
      -- \
      etc/inc/*.inc \
      etc/profile*/*.profile \

Note: The entries in the following profiles were sorted manually:

* etc/inc/disable-common.inc
* etc/inc/disable-programs.inc
* etc/profile-a-l/keepassxc.profile
* etc/profile-a-l/krunner.profile
* etc/profile-m-z/seamonkey.profile

Relates to #7040.

[1] https://www.firefox.com/en-US/firefox/147.0/releasenotes/
[2] https://specifications.freedesktop.org/basedir/latest/
[3] https://bugzilla.mozilla.org/show_bug.cgi?id=259356

etc/profile-m-z/torbrowser.profile

@@ -10,14 +10,17 @@ include globals.local
 ignore dbus-user none
 
 noblacklist ${HOME}/.cache/mozilla
+noblacklist ${HOME}/.config/mozilla
 noblacklist ${HOME}/.mozilla
 
 blacklist /sys/class/net
 blacklist /usr/libexec
 
 mkdir ${HOME}/.cache/mozilla/torbrowser
+mkdir ${HOME}/.config/mozilla
 mkdir ${HOME}/.mozilla
 whitelist ${HOME}/.cache/mozilla/torbrowser
+whitelist ${HOME}/.config/mozilla
 whitelist ${HOME}/.mozilla
 include whitelist-usr-share-common.inc