Emacs Keybindings - Firefox
GNU/Linux with GTK
Changing Keybindings
Firefox uses the GTK setting to determine whether Emacs-like/Readline-like keybindings are active in text fields, regardless of what window manager you use. To enable these keybindings, add the line
gtk-key-theme-name = "Emacs"
to ~/.gtkrc-2.0 (create the file if it doesn't exist) and restart Firefox.
If you use Gnome, you can set this using Desktop Preferences > Keyboard Shortcuts instead of editing the configuration file.
Note: This doesn't work in the latest gnome (2.8). In this case, you need to run "gconf-editor", and directly change the key /desktop/gnome/interface/gtk_key_theme from "Default" to "Emacs". Then if you restart Firefox, all is good in the world again.
Note: Running Gnome 2.8 under FC3 I found that under gconf-editor the gtk_key_theme was already set to Emacs, yet Firefox wasn't using the Emacs bindings. I edited .gtkrc-2.0 as indicated and then it started working. On another FC3 system I found that setting .gtkrc-2.0 as above didn't do the trick, I had to use gconf-editor as well. YMMV.
The Keybindings
The shortcuts are often called Emacs keybindings, but they're actually more similar to keybindings in Readline. When these keybindings are enabled, they override the standard keybindings in Gnome and Firefox (when a text entry field has focus).
Ctrl+A | Go to beginning of line |
Ctrl+E | Go to end of line |
Ctrl+F | Go right one character |
Ctrl+B | Go left one character |
Ctrl+K | Delete to end of line |
Ctrl+U | Delete entire line (different from readline, in which Ctrl+U deletes to the beginning of the line) |
Ctrl+W | Delete word, left |
Ctrl+H | Delete character, left (backspace) |
Ctrl+D | Delete character, right |
Additional Readline keys not supported by Firefox:
Ctrl+T transpose characters Ctrl+Y yank (like paste) Ctrl+P previous line (like Readline's Up) Ctrl+N next line (like Readline's Down) Ctrl+S search Ctrl+R reverse search Ctrl+J return Ctrl+M carriage return Ctrl+L redraw
Any OS, without GTK
If you don't use an operating system that has GTK (popular examples include Microsoft Windows and Mac OS X (which happens to use these bindings in nearly every program)), then you must unfortunately manually edit the res/builtin/platformHTMLBindings.xml file and add the following lines:
<!-- Emacsish single-line motion and delete keys --> <handler event="keypress" key="a" modifiers="control" command="cmd_beginLine"/> <handler event="keypress" key="e" modifiers="control" command="cmd_endLine"/> <handler event="keypress" key="b" modifiers="control" command="cmd_charPrevious"/> <handler event="keypress" key="f" modifiers="control" command="cmd_charNext"/> <handler event="keypress" key="h" modifiers="control" command="cmd_deleteCharBackward"/> <handler event="keypress" key="d" modifiers="control" command="cmd_deleteCharForward"/> <handler event="keypress" key="w" modifiers="control" command="cmd_deleteWordBackward"/> <handler event="keypress" key="u" modifiers="control" command="cmd_deleteToBeginningOfLine"/> <handler event="keypress" key="k" modifiers="control" command="cmd_deleteToEndOfLine"/> <!-- Emacsish single-line motion and delete keys --> <handler event="keypress" key="a" modifiers="control" command="cmd_beginLine"/> <handler event="keypress" key="e" modifiers="control" command="cmd_endLine"/> <handler event="keypress" id="key_left" key="b" modifiers="control" command="cmd_charPrevious"/> <handler event="keypress" id="key_right" key="f" modifiers="control" command="cmd_charNext"/> <handler event="keypress" id="key_delback" key="h" modifiers="control" command="cmd_deleteCharBackward"/> <handler event="keypress" id="key_delforw" key="d" modifiers="control" command="cmd_deleteCharForward"/> <handler event="keypress" id="key_delwback" key="w" modifiers="control" command="cmd_deleteWordBackward"/> <handler event="keypress" id="key_del_bol" key="u" modifiers="control" command="cmd_deleteToBeginningOfLine"/> <handler event="keypress" id="key_del_eol" key="k" modifiers="control" command="cmd_deleteToEndOfLine"/> <!-- Emacsish multi-line motion and delete keys --> <handler event="keypress" id="key_linedown" key="n" modifiers="control" command="cmd_lineNext"/> <handler event="keypress" id="key_lineup" key="p" modifiers="control" command="cmd_linePrevious"/>