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Midori - Tutorial

This document is licensed under the LGPL 2.1.

Writing a new extension

Check out the sources

bzr branch lp:midori

To develop and build extensions you need a source tree, typically it is a good idea to use the latest trunk to benefit from the latest and greatest features or bug fixes. So if your extension uncovers a bug you can easily report it and get it fixed. For more details see contribute which also covers how to make a branch and codying style in detail.

Add a new extension

The minimum starting point is a new .vala file in ./extensions/ in the Midori source folder. Let's call it “sandcat.vala” for the course of the tutorial.

The code to start with is this:

namespace Sandcat {
    private class Manager : Midori.Extension {
    internal Manager () {
        GLib.Object (name: _("Furry example extension"),
                         description: _("Take care of petting cats"),
                         version: "0.1" + Midori.VERSION_SUFFIX,
                         authors: "Jane Doe <email@domain.tld>");
public Midori.Extension extension_init () {                                                                                                                    
    return new Sandcat.Manager ();

Now let's proceed to run our rather empty extension.

_build/default/midori/midori -g -c ~/midoridevel

Inside Midori, open the Preferences, go to Extensions, and look for your new extension in the list. Activate and be proud of completing the first part of the tutorial!

Activating the extension

A basic principle is that each extension is loaded at first to describe what it does and to be shown in the preferences. At that point it doesn't do anything yet. Let's add basic callbacks to trigger after activation.

void browser_added (Midori.Browser browser) {
    stdout.printf ("a new browser was added, yay\n");
void activated (Midori.App app) {
    foreach (var browser in app.get_browsers ())
        browser_added (browser);
    app.add_browser.connect (browser_added);
void deactivated () {
    var app = get_app ();
    app.add_browser.disconnect (browser_added);

In your Manager you connect these new callbacks:

this.activate.connect (activated);
this.deactivate.connect (deactivated);

You'll see how when activated the extension gets an “app” which is a running Midori instance. It has among other things knowledge of browser windows. It's good practise to not make any assumptions on how many windows are open.

Working with (web) views

    void tab_added (Midori.Browser browser, Midori.Tab tab) {
        var view = tab as Midori.View;
        string uri = tab.uri;
        string title = tab.title;
    // in browser_added
        foreach (var tab in browser.get_tabs ())
                tab_added (browser, tab);
        browser.add_tab.connect (tab_added);
    // in destroyed
        foreach (var tab in browser.get_tabs ())
            browser.add_tab_disconnect (tab_added);

Add a context menu item

Unfinished API

    // in tab_added
    tab.context_menu.connect (add_menu_items);
    void add_menu_items (WebKit.HitTestResult hit_test_result, Midori.ContextAction menu) {
        if ((hit_test_result.context & WebKit.HitTestResultContext.SELECTION) == 0)
        var action = new Gtk.Action ("NotesCopySnippet", "Copy _snippet to notes", null, null);
        action.activate.connect (() => {
            stdout.printf ("my menu item rocks\n");
        menu.add (action);
        var submenu = new Midori.ContextAction ("NotesPaste", "Paste N_otes", null, null);
        for (int i = 0; i < 10; i++) {
            submenu.add (new Gtk.Action ("NotesSnippet%d".format (i), "Snippet #%i".format (i), null, null);
        menu.add (submenu);

Add an app menu item


Modify resources or webpages loaded


Add a statusbar item


Add a panel

// in private class Manager : Midori.Extension
GLib.List<Gtk.Widget> widgets; 
// in deactivated
    foreach (var widget in widgets)
        widget.destroy ();
// in activated
    widgets = new GLib.List<Gtk.Widget> ();
// in browser_added
    var viewable = new Sidebar ();
    viewable.show ();
    browser.panel.append_page (viewable);
    widgets.append (viewable);

Now on to adding a class implementing that panel.

private class Sidebar : Gtk.VBox, Midori.Viewable {
    public unowned string get_stock_id () {
        return "a-stock-id";
    public unowned string get_label () {
        return _("Purrfect");
    public Gtk.Widget get_toolbar () {
        return null;
    public Sidebar () {

Add a dialog


Add a URL completion