Might be related to Bugs 46014, 101629

Problem: Unable to get personalization to work. It seems to be a proxy problem.

Steps:
1.	On a Win10 machine with Firefox 40, Open Tools\Options\Personalization
2.	Click on Select Theme, LibreOffice,and search, search fails I think because the Internet\Proxy\System is not working.
3.	From Internet\Proxy\System, changing to Manual prevents changing back to System, changing to None, means you can never change to any other setting. The proxy seems to be working in 4.4.7.2, but that version's personalization  does not work with the current firefox.

This is what I tried to find something that worked:

Uninstalled, removed all LibriOffice from the hard drive and registry.
Installed 3.50rc3 from https://downloadarchive.documentfoundation.org/libreoffice/old/, The System setting was now set, but there is no personalization. Note: I had to install Java.
Installed overtop 3.6.04 (no personalization), Installed 4.0.0.1 (personalization fails with newer version of firefox), Installed 5.0.0.1, proxy seems broken, get setup bug warning 1946, uninstalled.
Installed 4.4.7.2, proxy working, personalization nearly works, found bug: https://bugs.documentfoundation.org/show_bug.cgi?id=101629
Installed 5.3.0.1, clean setup (no errors) crashes when pasting in: https://addons.mozilla.org/en-US/firefox/themes
Installed 5.3.0.2, get setup bug warning 1946, proxy broken, uninstalled.
Installed 5.2.7.2, proxy broken, doesn’t find anything in searching.

I was unable to find a work-around,it seems to be the same in 6.0, please let me know if there is a work-around or if both personalization and the system proxy are fixed. Thanks!