Examine source code of Search Companion

{
  "name": "Search Companion",
  "version": "1.2.2",
  "description": "A companion extension for web browsers to assist with Authority Searches.",
  "permissions": [
    "webNavigation",
    "tabs",
    "storage",
    "http://*/*",
    "https://*/*"
  ],
  "background": {
    "scripts": [
      "js/background/main.js"
    ],
    "persistent": true
  },
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "js": [
        "js/react/embed.js"
      ]
    }
  ],
  "web_accessible_resources": [
    "images/*"
  ],
  "options_page": "html/options.html",
  "browser_action": {
    "default_popup": "html/popup.html",
    "default_icon": {
      "16": "images/x16.png",
      "32": "images/x32.png",
      "48": "images/x48.png",
      "128": "images/x128.png"
    }
  },
  "icons": {
    "16": "images/x16.png",
    "32": "images/x32.png",
    "48": "images/x48.png",
    "128": "images/x128.png"
  },
  "manifest_version": 2
}