Emacs-mode is a Chrome browser extension (not to be confused with an Elisp Package). It adds "Emacs bindings and quick navigation without using the mouse". Typing a "?" in a web page will launch a list of key bindings.
Emacs-mode does not mimic Emacs navigation perfectly:still launches a new Chrome frame. It at least allows [C-x k] (or M-x kill-buffer) to close a browser tab, which is useful for those of us who have the command burned into our ROMs.