HTTPS Everywhere Update Channels Preferences has TypeError in 10.0a5
Open `about:addons` -> HTTPS Everywhere preferences -> `Preferences` tab -> `Update Channels`. Logged: `JavaScript error: resource:///actors/RFPHelperParent.jsm, line 29: TypeError: window.RFPHelper is undefined` Originally Reported: https://blog.torproject.org/comment/289060#comment-289060
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