Word from Mozilla is that one of the top crashers of Mozilla Firefox 3.6.13 (current version) is the Skype toolbar. This toolbar works with Firefox to detect phone numbers in webpages, turning them into clickable buttons. This extension is bundled with Skype and is clicked to be installed by default whenever someone downloads or updates Skype. Now Mozilla has found that over the past week this toolbar has been responsible for almost 40,000 crashes of Firefox. That's a lot.