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Georg Koppen authored
Shipping HTTPS-Everywhere based on the new WebExtensions model broke its functionality on higher security levels as our JavaScript blocking does not whitelist `moz-extension:` which is needed. It turns out that vanilla Firefox 52 ESR is affected as well but differently: Backorting https://bugzilla.mozilla.org/show_bug.cgi?id=1329731 does not help us as NoScript is regulating JavaScript related things. This fixes #21270 as well.