Examine source code of PrivacyScreen

{
  "manifest_version": 2,
  "name": "Privacy Screen",
  "version": "1.0.2",
  "description": "Browse the web and prevent shoulder surfing by automatically blurring sensitive webpage data.",
  "author": "@odacavo",
  "icons": {
    "16": "/src/icons/icon16.png",
    "48": "/src/icons/icon48.png",
    "128": "/src/icons/icon128.png"
  },
  "browser_action": {
    "default_icon": "/src/icons/icon19.png",
    "default_title": "PrivacyScreen",
    "default_popup": "/src/popup.html",
    "browser_style": false
  },
  "permissions": [
    "storage",
    "tabs"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "/src/privacyscreen.js"
      ],
      "css": [
        "/src/privacyscreen.css"
      ]
    }
  ],
  "background": {
    "scripts": [
      "/src/background.js"
    ],
    "persistent": false
  }
}