Examine source code of Save to Schedulist

{
  "name": "Save to Schedulist",
  "author": "Kingstinct",
  "version": "0.0.8",
  "description": "Description",
  "permissions": [
    "tabs",
    "*://*/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "js": [
        "contentScript.js"
      ],
      "css": [
        "assets/css/main.css"
      ]
    }
  ],
  "browser_action": {
    "default_title": "Save to Schedulist",
    "default_icon": {
      "16": "assets/icons/icon_16.png",
      "48": "assets/icons/icon_48.png",
      "128": "assets/icons/icon_128.png"
    }
  },
  "icons": {
    "16": "assets/icons/icon_16.png",
    "48": "assets/icons/icon_48.png",
    "128": "assets/icons/icon_128.png"
  },
  "web_accessible_resources": [
    "assets/images/spinner.gif"
  ],
  "manifest_version": 2
}