Mozilla announced yesterday that it will block the Skype Toolbar add-on for Firefox and remotely disable it for existing users. Mozilla was forced to take this extraordinary measure after discovering that severe bugs in the add-on are crippling the browser’s performance and stability.

The Skype Toolbar add-on is developed by Skype and comes bundled with the company’s popular chat program. The add-on appears to be injected into Firefox automatically during the Skype installation and update process. Its primary function is to identify strings of text in Web pages that look like phone numbers and transparently convert them to links that can be used to automatically dial a call with Skype.

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Mozilla blocks Skype add-on: caused 33k Firefox crashes in a week