Changes

<font color="red">'''[NEWRESOLVED WONTFIX]'''</font> [https://bugzilla.mozilla.org/show_bug.cgi?id=1189284 Bug 1189284] - [Control Center] Nightly becomes unresponsive after changing windows themes while the control center is opened<br/><font color="red">'''[NEW]'''</font> [https://bugzilla.mozilla.org/show_bug.cgi?id=1195753 Bug 1195753] - [Control Center] First panel gets wider when switching panels quickly using the keyboard<br/><font color="red">'''[NEW]'''</font> [https://bugzilla.mozilla.org/show_bug.cgi?id=1195757 Bug 1195757] - [Control Center] about:cache shows "Connection is not secure"<br/>