Fuel 0.2 Progress

In case you missed it, Fuel 0.1 recently landed in Firefox 3.0a4.

Fuel 0.1 focused on building a solid foundation for further development; laying a good application and events layer, and building out Preference management. Much of our original plan was scaled back due to the nature of how JavaScript APIs need to be written using XPCOM and IDLs. In a nutshell: Dynamically-generated properties are out, as are optional arguments, and arguments that contains non-primitive objects (arrays, objects, regexps, etc.).

The plan for Fuel 0.2 is pretty well defined at this point. We’re on track to have it land in Firefox 3.0a5.

Specifically, Fuel 0.2 is going to be dealing with two things: Browser tabs and Bookmarks. We have a fairly-complete version of the Fuel 0.2 API up, this will be on top of the existing Fuel 0.1 API.

If you’re curious what this new code is going to look like, here’s some examples from our current plan:

NOTE All of the following is subject to change – please view the final plan and API before attempting to use.


Open, and activate, a new tab

Application.browser.open("http://google.com/").active = true;

Open, and activate, a tab just after the current tab

var tab = Application.browser.open("http://google.com/");
Application.browser.insertBefore( tab, Application.browser.activeTab.next );
tab.active = true;


var tab = Application.browser.open("http://google.com/");
tab.index = Application.browser.activeTab + 1;
tab.active = true;

Move the active tab to be the first tab



Application.browser.activeTab.index = 0;

Close the active tab


Do something when the active tab loads

Application.browser.activeTab.events.addListener( "load", function(){
  this.query("#foo div")

Change the URL in the active tab

Application.browser.activeTab.url = "http://mozilla.org/";

Close all Google-related tabs

  if ( tab.url.match(/google/) )

Re-use a tab, or open a new one

var url = "http://google.com/";
  if ( tab.url == url )
    return tab.active = true;
}) || Application.browser.open( url ).active = true;

Stop the user from opening any new tabs

Application.browser.events.addListener( "TabOpen", function(e){


Log the title of all top-level bookmarks:

  console.log( "title", cur.title );

Add a new bookmark:

Application.bookmarks.add("Mozilla", "http://mozilla.org/");

Remove all bookmarks that point to Google:

  if ( cur.url.match(/google.com/) )

Add a new bookmark, if one doesn’t already exist:

var url = "http://google.com/";
  if ( cur.url == url )
    return true;
}) || Application.bookmarks.add( "Google", url );

If you’re interested in tracking our progress on Fuel 0.2, feel free to CC yourself on the tracking ticket for it. If all goes well, this should be in your hands by the time the Firefox 3.0 betas are rolling out. I’m really excited to see some new applications come out that are built on this code.

Posted: May 18th, 2007

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