Mozilla has barred a Skype extension for Firefox, accusing it of causing 40,000 browser crashes a week and of dramatically slowing page-load times.

"We believe that both of these items constitute a major, user-facing issue, and meet our established criteria for blocklisting an add-on," Mozilla said in a blog post yesterday. Because the extension is installed by default when Skype's main software is installed, a "large number of Firefox users who have installed Skype have also installed the Skype Toolbar, knowingly or unknowingly," Mozilla said.

Mozilla is in contact with Skype programmers and will restore the extension's privileges if the problems are addressed, the organization said.

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