Examine source code of AutoCompose

{
  "name": "AutoCompose",
  "version": "1.3.0",
  "description": "Generate comprehensive, articulate and amazing responses for emails and threads",
  "permissions": [
    "storage",
    "tabs",
    "http://*/",
    "https://*/"
  ],
  "background": {
    "scripts": [
      "/background.js"
    ],
    "persistent": false
  },
  "browser_action": {
    "default_icon": {
      "16": "icons/autocompose_v2-16.png",
      "48": "icons/autocompose_v2-48.png",
      "128": "icons/autocompose_v2-128.png"
    },
    "default_popup": "/popup.html"
  },
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "js": [
        "/scripts/contentScript.js"
      ]
    }
  ],
  "icons": {
    "16": "icons/autocompose_v2-16.png",
    "48": "icons/autocompose_v2-48.png",
    "128": "icons/autocompose_v2-128.png"
  },
  "web_accessible_resources": [
    "css/*",
    "icons/*"
  ],
  "manifest_version": 2
}