It looks like the database of 44,000 inactive addons.mozilla.org accounts has been mistakenly left on a public Mozilla server.
According to the official blog post, it affects accounts created prior to April 9th, 2009 that use older, md5-based password hashes. As of today, all the data is secured with SHA-512 password hash.
Impacted users were notified on December 27th and potential treat has been already removed.
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Vygantas is a former web designer whose projects are used by companies such as AMD, NVIDIA and departed Westood Studios. Being passionate about software, Vygantas began his journalism career back in 2007 when he founded FavBrowser.com. Having said that, he is also an adrenaline junkie who enjoys good books, fitness activities and Forex trading.