Activity Stream Router
Preferences browser.newtab.activity-stream.asrouter.*
| Name | Used for | Type | Example value | 
| allowHosts | Allow a host in order to fetch messages from its endpoint | [String] | ["gist.github.com", "gist.githubusercontent.com", "localhost:8000"] | 
| providers.snippets | Message provider options for snippets | Object | see below | 
| providers.cfr | Message provider options for cfr | Object | see below | 
| providers.onboarding | Message provider options for onboarding | Object | see below | 
| useRemoteL10n | Controls whether to use the remote Fluent files for l10n, default as true | Boolean | `[true | 
Message providers examples
{
  "id" : "snippets",
  "type" : "remote",
  "enabled": true,
  "url" : "https://snippets.cdn.mozilla.net/us-west/bundles/bundle_d6d90fb9098ce8b45e60acf601bcb91b68322309.json",
  "updateCycleInMs" : 14400000
}
{
  "id" : "onboarding",
  "enabled": true,
  "type" : "local",
  "localProvider" : "OnboardingMessageProvider"
}