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>Support for inspecting ::before and ::after pseudo elements

Oh yes, this is a long-awaited improvement.

It's about time! This was one of my biggest annoyances when I tried migrating from Chrome's dev tools over to Firefox.

One nice thing about this release is the ability to switch to the more compact dev-edition theme.

In about:config search for: browser.devedition.theme.enabled and set it to 'true'

Set devtools.theme to 'dark' for the dark theme (I've left this disabled as I don't like how the icons look with the dark UI).

Firefox Hello?? Why does that need to be in a web browser?

It's a sample implementation of WebRTC, a technology that will be very useful to have integrated into the browsing experience.

Still no swipe animation/indicator for OS X.

Firefox 35 release notes