Examine source code of InView

{
  "name": "InView",
  "version": "1.2.0",
  "description": "Add an InView invoice and bill calendar widget to the dashboard of your Xero account",
  "background": {
    "scripts": [
      "scripts/background.js"
    ],
    "persistent": true
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.xero.com/Dashboard/",
        "*://*.xero.com/Dashboard/default.aspx",
        "*://*.xero.com/Dashboard/Default5.aspx",
        "*://*.xero.com/app/*/dashboard"
      ],
      "css": [
        "styles/fullcalendar.min.css",
        "styles/styles.css"
      ],
      "js": [
        "scripts/jquery.min.js",
        "scripts/moment.js",
        "scripts/popper.min.js",
        "scripts/tooltip.min.js",
        "scripts/fullcalendar.js",
        "scripts/index.js"
      ],
      "run_at": "document_start"
    }
  ],
  "permissions": [
    "*://www.inviewapp.com/*"
  ],
  "icons": {
    "16": "images/icon16.png",
    "32": "images/icon32.png",
    "48": "images/icon48.png",
    "128": "images/icon128.png"
  },
  "manifest_version": 2,
  "browser_specific_settings": {
    "gecko": {
      "id": "{7262d1b3-b5c4-401f-8301-d11ee49d1823}"
    }
  }
}