Rated 4 out of 5 stars
Why use built-in Inspect Ctrl+Shift+I Hotkey?This review is for a previous version of the add-on (2.0.12).
DOM Inspector is over 10 years old and is the precursor to the web inspectors which are most popular right now, like Firebug and the WebKit inspector.
Since DOM Inspector wasn't created after the devtools inspector, it isn't that anyone looked at its shortcut and said, "Oh, we'll use that." It's simply that DOM Inspector's shortcut has been Cmd+/Ctrl+Shift+I for a long time—for an even longer time than other inspectors have existed—then the devtools inspector was created and used the same shortcut (only on Windows now), and DOM Inspector's didn't change.