Mozilla has apologized for the fiasco earlier this month when an expired certificate disabled most users' Firefox add-ons.

"We strive to make Firefox a great experience. Last weekend we failed, and we're sorry," Joe Hildebrand, the recently named head of Firefox engineering, wrote in a post to a company blog. "We let you down and what happened might have shaken your confidence in us a bit, but we hope that you'll give us a chance to earn it back," Hildebrand concluded.

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The gaffe began just after 9 p.m. ET on Friday, May 3, when a certificate used to digitally sign Firefox extensions expired. Because Mozilla had neglected to renew the certificate, Firefox assumed add-ons could not be trusted – that they were potentially malicious – and disabled any already installed. Add-ons could not be added to the browser for the same reason.

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