Firefox Addon观察者http-on-modify-request无法正常工作(Firefox Addon observer http-on-modify-request not working properly)

 解决了！ 
 
 通过正在进行的研究，搜索论坛和源代码库，我只用libwebkit和标准compiz桌面（任何带有合成的Xorg桌面都应该这样做）来完成这些必要步骤。 
 
 对于当前的libwebkit（1.1.10-SVN），有一个Ubuntu PPA： 
 
deb http://ppa.launchpad.net/webkit-team/ppa/ubuntu jaunty main
deb-src http://ppa.launchpad.net/webkit-team/ppa/ubuntu jaunty main
 
 就代码而言，关键是调用webkit_web_view_set_transparent 。 
 
 当然，你运行它的系统应该有一个有能力的图形卡（intel，radeon或nvidia），并运行合成窗口管理器（如Compiz）。 
 
 最后，为了真正看到透明度，您查看的内容必须使用CSS3设置透明背景，否则它仍然是完全不透明的。 
 
 这很简单： 
 
BODY { background-color: rgba(0,0,0,0); }
 
 这里是最简单的webkit浏览器应用程序的完整示例，支持透明度： 
 
#include <gtk/gtk.h>
#include <webkit/webkit.h>

static void destroy_cb(GtkWidget* widget, gpointer data) {
  gtk_main_quit();
}

int main(int argc, char* argv[]) {
  gtk_init(&argc, &argv);

  if(!g_thread_supported())
    g_thread_init(NULL);

  // Create a Window, set colormap to RGBA
  GtkWidget* window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
  GdkScreen *screen = gtk_widget_get_screen(window);
  GdkColormap *rgba = gdk_screen_get_rgba_colormap (screen);

  if (rgba && gdk_screen_is_composited (screen)) {
    gtk_widget_set_default_colormap(rgba);
    gtk_widget_set_colormap(GTK_WIDGET(window), rgba);
  }

  gtk_window_set_default_size(GTK_WINDOW(window), 800, 800);
  g_signal_connect(window, "destroy", G_CALLBACK(destroy_cb), NULL);

  // Optional: for dashboard style borderless windows
  gtk_window_set_decorated(GTK_WINDOW(window), FALSE);


  // Create a WebView, set it transparent, add it to the window
  WebKitWebView* web_view = web_view = WEBKIT_WEB_VIEW(webkit_web_view_new());
  webkit_web_view_set_transparent(web_view, TRUE);
  gtk_container_add (GTK_CONTAINER(window), GTK_WIDGET(web_view));

  // Load a default page
  webkit_web_view_load_uri(web_view, "http://stackoverflow.com/");

  // Show it and continue running until the window closes
  gtk_widget_grab_focus(GTK_WIDGET(web_view));
  gtk_widget_show_all(window);
  gtk_main();
  return 0;
}
 
 截图！ http://i27.tinypic.com/2qntlxl.jpg 

Solved!
 
Through ongoing research, scouring forums and source code repositories, I peiced together the necessary steps to accomplish this using only libwebkit and a standard compiz desktop (any Xorg desktop with compositing should do).
 
For a current libwebkit (1.1.10-SVN), there is an Ubuntu PPA:
 
deb http://ppa.launchpad.net/webkit-team/ppa/ubuntu jaunty main
deb-src http://ppa.launchpad.net/webkit-team/ppa/ubuntu jaunty main
 
As far as the code goes, the key is calling webkit_web_view_set_transparent.
 
And of course the system you're running it on should have a capable graphics card (intel, radeon, or nvidia) and be running a compositing window manager (like Compiz).
 
And finally, to actually see transparency, the content you're viewing must set a transparent background using CSS3, otherwise it's still completely opaque.
 
It's as simple as:
 
BODY { background-color: rgba(0,0,0,0); }
 
Here' is the full sample for the simplest possible webkit browser app, with transparency support:
 
#include <gtk/gtk.h>
#include <webkit/webkit.h>

static void destroy_cb(GtkWidget* widget, gpointer data) {
  gtk_main_quit();
}

int main(int argc, char* argv[]) {
  gtk_init(&argc, &argv);

  if(!g_thread_supported())
    g_thread_init(NULL);

  // Create a Window, set colormap to RGBA
  GtkWidget* window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
  GdkScreen *screen = gtk_widget_get_screen(window);
  GdkColormap *rgba = gdk_screen_get_rgba_colormap (screen);

  if (rgba && gdk_screen_is_composited (screen)) {
    gtk_widget_set_default_colormap(rgba);
    gtk_widget_set_colormap(GTK_WIDGET(window), rgba);
  }

  gtk_window_set_default_size(GTK_WINDOW(window), 800, 800);
  g_signal_connect(window, "destroy", G_CALLBACK(destroy_cb), NULL);

  // Optional: for dashboard style borderless windows
  gtk_window_set_decorated(GTK_WINDOW(window), FALSE);


  // Create a WebView, set it transparent, add it to the window
  WebKitWebView* web_view = web_view = WEBKIT_WEB_VIEW(webkit_web_view_new());
  webkit_web_view_set_transparent(web_view, TRUE);
  gtk_container_add (GTK_CONTAINER(window), GTK_WIDGET(web_view));

  // Load a default page
  webkit_web_view_load_uri(web_view, "http://stackoverflow.com/");

  // Show it and continue running until the window closes
  gtk_widget_grab_focus(GTK_WIDGET(web_view));
  gtk_widget_show_all(window);
  gtk_main();
  return 0;
}