Flight CO2 emissions

manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 2,
  "name": "Flight CO2 emissions",
  "description": "Displays CO2 emissions from goclimateneutral.org on Google Flights.",
  "version": "0.1.2.1",
  "permissions": [
    "background",
    "https://api.goclimateneutral.org/*",
    "https://flight-emissions.appspot.com/flight_footprint"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "content_scripts": [
    {
      "matches": [
        "https://www.google.com/flights*"
      ],
      "js": [
        "content.js",
        "details.js",
        "humanize-duration.js"
      ],
      "run_at": "document_end"
    }
  ],
  "web_accessible_resources": [
    "icons/small_tree.png",
    "icons/carbonoffset.png"
  ],
  "page_action": {
    "default_icon": {
      "32": "icons/flights_32.png",
      "48": "icons/flights_48.png",
      "128": "icons/flights_128.png"
    }
  },
  "icons": {
    "32": "icons/flights_32.png",
    "48": "icons/flights_48.png",
    "128": "icons/flights_128.png"
  }
}