Examine source code of LeakIX

{
  "name": "LeakIX",
  "version": "0.0.4",
  "manifest_version": 2,
  "description": "The LeakIX extension warns you about potential security issues on the websites you're visiting",
  "icons": {
    "16": "img/16x16.png",
    "48": "img/48x48.png",
    "128": "img/128x128.png"
  },
  "background": {
    "scripts": [
      "js/background.js"
    ]
  },
  "browser_action": {
    "default_icon": {
      "16": "img/16x16.png",
      "19": "img/19x19.png",
      "38": "img/38x38.png",
      "48": "img/48x48.png",
      "128": "img/128x128.png"
    },
    "default_title": "LeakIX - click for details",
    "default_popup": "html/popup.html"
  },
  "permissions": [
    "tabs",
    "contextMenus",
    "https://leakix.net/"
  ]
}