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Mozilla introduced extension signing as a way to make it harder for an attacker to get a malicious add-on running in a user's browser. See: https://blog.mozilla.org/addons/2015/02/10/extension-signing-safer-experience and https://blog.mozilla.org/addons/2016/01/22/add-on-signing-update/ for some background information. Since ESR45 this feature is enabled by default and we exempt EFF's HTTPS-Everywhere from this requirement.
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