Control Firefox from Emacs
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moz-controller: Control Firefox from Emacs

It’s annoying to switch between your text editor and your web browser constantly when you’re hacking and reading web pages at the time. moz-controller allows you to control Firefox to scroll, refresh, zoom in, zoom out, close tabs and switch tabs without leaving Emacs.

Video Demo

Functions and Keybindings

get current tab’s urlmoz-controller-get-current-urlC-c m l
refreshmoz-controller-page-refreshC-c m R
scroll downmoz-controller-page-downC-c m n
scroll upmoz-controller-page-upC-c m p
zoom inmoz-controller-zoom-inC-c m +
zoom outmoz-controller-zoom-outC-c m -
zoom resetmoz-controller-zoom-resetC-c m 0
switch to previous tabmoz-controller-tab-previousC-c m b
switch to next tabmoz-controller-tab-nextC-c m f
close current tabmoz-controller-tab-closeC-c m k
view page source codemoz-controller-view-page-sourceC-c m u


Firefox Plugin

Install MozRepl in Firefox.

Manual Installation

First install moz.el in Emacs (you can install it via Emacs package systems such as el-get).

Then install moz-controller:

git clone

and add the following code in your .emacs or init.el:

(add-to-list 'load-path "/path/to/emacs-moz-controller")
(require 'moz-controller)

Package Installation

moz-controller is available on melpa:

  • Make sure you have melpa in the package-archives list:
    (require 'package)
    (add-to-list 'package-archives
                 '("melpa" . "") t)
    (when (< emacs-major-version 24)
      ;; For important compatibility libraries like cl-lib
      (add-to-list 'package-archives '("gnu" . "")))
  • Press M-x package-list-packages to get a list of Emacs extensions.
  • Find moz-controller and install it from there.


After installation, press M-x moz-controller-mode to turn on/off moz-controller-mode in the current buffer.

Press M-x moz-controller-global-mode to turn on/off moz-controller-global-mode in all buffers, including future buffers.

To turn on moz-controller-mode globally by default, you can add (moz-controller-global-mode t) to your .emacs or init.el.

Define New Commands

I have a macro defined in moz-controller: defun-moz-controller-command

You can use it to define new moz-controller commands, for example:

(defun-moz-controller-command moz-controller-zoom-in ()
  "Zoom in."
  (concat "gBrowser.selectedBrowser.markupDocumentViewer.fullZoom += "
          (number-to-string moz-controller-zoom-step) ";")

Where moz-controller-zoom-in is the function name, “Zoom in.” is the docstring, (concat …) is the command (in string format) you want MozRepl to execute.



See the LICENSE file.


(C) 2014 任文山 (Ren Wenshan) All rights reserved. renws1990 at