All the packages you mentioned are not GNOME packages, meaning they are
not maintained by upstream GNOME, cf.
http://live.gnome.org/TwoPointFifteen/Desktop
If you want to get the issues fix, you need to write bug reports for the
indiviudal applications - that's nothing that can be fixed in control-
center.
** Changed in: control-center (Ubuntu)
Sourcepackagename: control-center => firefox
Assignee: Ubuntu Desktop Bugs => (unassigned)
Status: Needs Info => Unconfirmed
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Network Proxy settings ignored by Gnome apps
https://launchpad.net/bugs/61418
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