As above - should be `ctrl+shift+i` /  `cmd+alt+i` (for Mac support as well).  Also, for some reason neither `ctrl+3` or `cmd+3` seem to work for me (on canary at least) - you may just say "Open the 'Sources' tab instead.  @addyosmani, is there an existing documentation page about this form of devtools inception that we could be linking to?