This is the fix Mozilla has published to be installed via shield studies, but skipping the shield studies part. You can be sure it's not malicious because it is signed by Mozilla... and if your browser installed unsigned extensions you wouldn't be looking for this solution in the first place.
Apparently beta and nightly need to change `Components.utils.import` to `ChromeUtils.import`.
But anyways, don't use this now, use the semi-official fix of clicking on this link and letting it install: https://storage.googleapis.com/moz-fx-normandy-prod-addons/e...
This is the fix Mozilla has published to be installed via shield studies, but skipping the shield studies part. You can be sure it's not malicious because it is signed by Mozilla... and if your browser installed unsigned extensions you wouldn't be looking for this solution in the first place.