Bug 952401 - Collect scroll and pageStyle data as soon as the frame tree is available r=smacleod

From 84ca4ca357b94a5dc9449627e88bb4e3cde69557 Mon Sep 17 00:00:00 2001
Bug 952565 - Minor style tweaks for the Toolbox tabbar, r=bgrins
Merge fx-team to m-c