We haven’t found an easy way to determine which tab the sound is coming from, but the reason anyone wants to know that is usually to shut off the sound from that tab. Maybe the Firefox add-on “Stop Autoplay” will work for you: this add-on prevents audio from automatically playing

One of the best add-ons for web developers is . Firebug integrates with Firefox to put a wealth of development tools at your fingertips while you browse. You can edit, debug, and monitor CSS, HTML, and JavaScript live in any web page. Related posts: Web Developer’s Toolbox for Firefox IE

Checking links one by one for the nofollow attribute is tedious. NoDoFollow (by Zachary Fox)shows which links on a page have the nofollow attribute and which are regular follow links. Related posts: Screen Capture Firefox Add-on Firefox Firebug Extension Web Developer’s Toolbox for Firefox

When you are designing sites in Firefox, it is really tedious to check every single modification in Internet Explorer. You can use the IE Tab add-on to show you from within Firefox how your pages will look in IE. Related posts: Show Related Posts in WordPress Web Developer’s Toolbox for

The Web Developer’s Toolbox for Firefox offers some of the most popular add-ons for Firefox. The add-ons for web designers and developers will let you troubleshoot, edit, and debug web projects without ever clicking away from Firefox. Related posts: Show Related Posts in WordPress IE Plugin for Firefox Firefox Firebug

By using the Power Twitter Firefox addon you get URL expansion or shrinking, inline YouTube, Flickr, TwitPic, Google Maps, song.ly, search scoped to a specific user, custom settings, @mentions and more.   Related posts: Manage Multiple Users Over Several Twitter Accounts Join Twibes Twitter Groups Find Relevant Followers On Twitter