Util: avoid setting same value to attribute
RedirectParser: check invalid pref value
PrettyPrint: add extra line after '};'
PrettyPrint: fix wrong description
PrettyPrint: clarify options which are passed to beautifier
Misc: remove wrong param

* the default value of |browser.sessionstore.resume_from_crash| is |true|
  see http://mxr.mozilla.org/mozilla-release/source/browser/app/profile/firefox.js#759
Misc: fx20: fix deprecated |gPrivateBrowsingUI|

* https://developer.mozilla.org/en-US/docs/Updating_addons_broken_by_private_browsing_changes#Chrome_APIs
MoveTabToWindow: fx20: follow per-window private browsing

* make a menuitem itself of a private window
* make unable to move a tab to a window which is in private
PageInfo-SortList: fx20: use |WeakMap::clear|

* see https://bugzilla.mozilla.org/show_bug.cgi?id=814562
TabEx: remove tab color feature

* in Fx20 |mozIColorAnalizer::findRepresentativeColor| raises an error;
  Error: ColorAnalyzer worker: rgb2lab is not defined
  resource://gre/components/ColorAnalyzer.js

* cf. https://bugzilla.mozilla.org/show_bug.cgi?id=634139