The new view-source in a tab doesn't work for me on Nightly with e10s enabled. The Browser Console shows this error: "TypeError: contentWindow is null viewSource-content.js:227:11" Interestingly it does seem to work when I enter "view-source:http://example.org" in the urlbar directly. However opening view source with the context-menu doesn't work.
What URL were you testing on? Was it a chrome page, like "about:addons"?
Nope, both times I tried http://example.org/.
Hmm, I am not seeing this error in a fresh build of fx-team. Could you try a clean profile, to be sure it's not something like a config setting or add-on?
I think you might be onto something. View-source does work in a new clean profile. It doesn't work even in safe-mode with my existing profile.
On IRC, we discovered :evilpie has processCount > 1.