Once you have installed the extension, a new TV button is present in the Firefox bar:

You can manually toggle TV support for a given site by clicking on this button. When a visited site sends specific HbbTV or CE-HTML content-type response headers, the TV support is automatically activated because Firefox cannot handle those pages on its own:

• application/vnd.hbbtv.xhtml+xml
• application/ce-html+xml

Once activated, the plugin interface wraps around the page body. The body is assumed to be 1280x720 and the plugin button bar allows you configuring the display and behaviour.

The page is then refreshed and the HbbTV support is injected within the page. Moreover, cross-site XMLHttpRequest is allowed from the page to reproduce common TV security policy implementation.

All navigation is done with the keyboard, simulating a remote control. Details about keyboard shortcuts can be displayed by clicking the "Remote Control" button.

The display smartly resizes so that the body is entirely visible in the Firefox window. Moreover, the aspect ratio button allows to visualize the rendering on TV screen with aspect ratio different from 16:9. The smart resize/scaling informations are displayed.

The HbbTV norms recommends displaying usefull page content inside a "safe" area. The "margin display" button materializes this safe area by displaying translucent margins.

By default the special HbbTV video/broadcast object is displayed with the default logo.

You can customize the display of special HbbTV video/broadcast object with the "TV Image" button by choosing a custom image to replace the default logo.

You can choose the current channel with the "Channels" combo-box. A default channel list is embedded inside the plugin. You can use your own channel list in the configuration panel.

To see a channel list example, just click on the "Default" link to display the embedded channel list.

You can simulate the trigger of DSM-CC "Do-it-now" stream events. The video/broadcast object supports the addStreamEventListener() method to register your stream event listeners. To display the stream event panel, just click on the "Stream Events" button

You can trigger those events by filling in the "name" and "data" field of the stream event panel and then click the "Trigger" button.

A minimal support for dvb:// is included inside the plugin. You have three ways to use it :

Browsing local files as if they were embedded inside a carousel

1. Open a file:/// url in a tab and then activate the TV support
2. You are redirected to a virtual url : dvb://localfile.fire.tv/index.html
3. This allows you to browse local content with TV support

Requesting carousel files with XMLHttpRequest

As specified in the HbbTV norm, you can request DSM-CC carousel with XMLHttpRequest. In order to make it work you first have to choose a local DVB root directory withing the configuration panel. Once chosen, you can make request to DSM-CC carousel.

Ex:

• URL : dvb://123.321.253.13/index.html
• 13 represents the carousel component tag, that means you must have a directory named 13 inside your DVB root directory.
• For this request to return a status other that "404-Not Found", you must have a file named index.html inside that
13 directory.

DVB ait specifiers

You can also use dvb:// uri with AIT (application information table) specifiers : dvb://current.ait/<orgId>.<appId>

Ex:

• URL : dvb://current.ait/2a.1b

In that case, you reference an application whose root url may be either a dvb or http url. You can simulate this behaviour with the plugin by placing a file named 2a.1b inside your DVB root directory. That file must be a plain text one containing either an http:// url or a file:// url. The result of the dvb request is an XML ait.

You can have an idea of HbbTV specification support by browsing the following HbbTV testsuite : http://itv.mit-xperts.com/hbbtvtest/