Bug 1073240 - update Firefox's default theme icon, hide menu on non-default themes, r=jaws

--HG--
extra : rebase_source : 3651f3e80cf537c365a6ab4a0659221fb6d50d4b
Bug 1070888 - set position and flip attribute so lightweight themes panel in customize mode opens correctly, r=jaws

--HG--
extra : rebase_source : 9a34be6c24641103c7c0b70573322b2defe0c90d
Bug 1076252 - [10.10] disabled default button shouldn't get white text on yosemite, r=jaws
Merge m-c to f-t
Bug 1039500 - Created a field with a WeakMap to record the tab for each browser and made _getTabForBrowser non-private. r=dao
Bug 1076887 - Update the tree's copy of the mozilla/source-map library to 0.1.40. r=past
Bug 1077376 - don't prettify original sources in the style editor. r=pbrosset
Bug 1007436 - "Revamp visual design of about:feedback". r=margaret.leibovic f=alam
merge fx-team to mozilla-central a=merge