Examine source code of Pagereview.io

{
  "name": "Pagereview.io",
  "version": "1.3.8",
  "manifest_version": 2,
  "description": "Pagereview.io add-on to help users collaborate on website designs.Leave comments on page node, reply and collaborate with team.",
  "homepage_url": "https://pagereview.io",
  "icons": {
    "16": "icons/grey_icon16.png",
    "48": "icons/grey_icon48.png",
    "128": "icons/grey_icon128.png"
  },
  "default_locale": "en",
  "background": {
    "scripts": [
      "src/bg/background.js"
    ],
    "persistent": false
  },
  "browser_action": {
    "default_icon": {
      "16": "icons/grey_icon16.png",
      "48": "icons/grey_icon48.png",
      "128": "icons/grey_icon128.png"
    },
    "default_title": "Pagereview.io",
    "default_popup": "src/browser_action/browser_action.html"
  },
  "permissions": [
    "tabs",
    "storage",
    "activeTab",
    "http://*/*",
    "https://*/*"
  ]
}