With Tuesday’s release of Firefox 40, Mozilla has begun the process of requiring all add-ons for the browser to be signed. The company announced the forthcoming change in February, and Firefox 40 is the first version to warn users about unsigned add-ons.
The goal for the change in policy is to protect users from malicious extensions and add-ons, a problem that has arisen in various browsers over the years. Google has taken the approach of only allowing developers to distribute extensions through its Chrome Web Store.
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