On January 20th, 2011, the Skype Toolbar extension was added to Firefox’s add-on blocklist for causing Firefox to crash and imparting a significant performance hit on DOM manipulation. We’ve been in contact with Skype since that time, and have provided information to identify the crashes our users are seeing, along with suggested methods to reduce the performance impacts of their extension.
The Skype development team have been working on those issues, and released a new version of the Skype Toolbar for Firefox this week. We’ve tested this new version, and have found it corrects the conditions that caused Firefox to crash, and significantly reduces the performance impacts that led to its blocklisting. As a result, we’ve modified the blocklist such that versions of the extension equal or greater than 18.104.22.16865 are no longer soft-blocked.
Skype users can obtain the new version of the extension by updating their copy of Skype, or by downloading a new version from the Skype website.