Examine source code of Weather Forecast

{
  "name": "Weather Forecast",
  "description": "__MSG_description__",
  "default_locale": "en",
  "version": "0.6.0",
  "manifest_version": 3,
  "permissions": [
    "declarativeNetRequestWithHostAccess",
    "storage",
    "alarms",
    "idle",
    "contextMenus"
  ],
  "host_permissions": [
    "*://www.wunderground.com/*",
    "*://api.weather.com/*"
  ],
  "declarative_net_request": {
    "rule_resources": [
      {
        "id": "ruleset-popup",
        "enabled": false,
        "path": "rules-popup.json"
      },
      {
        "id": "ruleset-worker",
        "enabled": true,
        "path": "rules-worker.json"
      }
    ]
  },
  "action": {
    "default_title": "To get badge notification, open popup -> Find location -> Press 'View Full Forecast'"
  },
  "background": {
    "service_worker": "worker.js",
    "scripts": [
      "sax.js",
      "extra.js",
      "context.js",
      "worker.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "*://www.wunderground.com/*"
      ],
      "js": [
        "/data/inject/clean.js",
        "/data/inject/observe.js"
      ],
      "run_at": "document_start",
      "all_frames": true
    }
  ],
  "homepage_url": "https://webextension.org/listing/forecast-plus.html",
  "icons": {
    "16": "/data/icons/16.png",
    "24": "/data/icons/24.png",
    "32": "/data/icons/32.png",
    "48": "/data/icons/48.png",
    "64": "/data/icons/64.png",
    "128": "/data/icons/128.png",
    "256": "/data/icons/256.png"
  },
  "options_ui": {
    "page": "/data/options/index.html",
    "open_in_tab": true
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{98ab7bc7-0e75-430c-92cb-d27a0e48b23d}",
      "strict_min_version": "148.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}