Bug 972341 - Mark a hidden window's docShell as inactive r=bz
Bug 972341 - Propagate docShell.isActive to remote browsers
Bug 972341 - Simplify changes from bug 910036 to use document.hidden r=adw
Bug 972341 - Add docShell.setForceActive() to force active docShells r=smaug
Bug 972341 - Force active hiddenWindow docShells for a11y/test_docload.html
changes