We should check that  doesn't recommend legacy addons, but just signed web extensions. If it does, we should change it.  - https://github.com/mozilla/telemetry-batch-view/blob/master/src/main/scala/com/mozilla/telemetry/ml/AddonRecommender.scala
After discussing this on #AMO, it turns out we can change the AMODatabase scala code  to also dump the |is_webextension| property for every addon. If the listed addon type is an "extension" and the |is_webextension| is false, then it's a legacy addon. Other addon types will continue to be legacy addons (e.g. "search", "language", "dictionary" types).  - https://github.com/mozilla/telemetry-batch-view/blob/master/src/main/scala/com/mozilla/telemetry/ml/AMODatabase.scala  - http://addons-server.readthedocs.io/en/latest/topics/api/addons.html#version-detail
Created attachment 8892944 [details] [review] Part 1 - Add the isWebextension to the recommender output
This was reviewed and merged.