Examine source code of SearchBinder

{
  "applications": {
    "gecko": {
      "id": "SearchBinder@searchbinder.com",
      "strict_min_version": "42.0"
    }
  },
  "name": "SearchBinder",
  "version": "1.0.12",
  "manifest_version": 2,
  "icons": {
    "16": "search_binder/icons/icon16x16active.png",
    "48": "search_binder/icons/icon48x48active.png",
    "128": "search_binder/icons/icon128x128active.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "js": [
        "search_binder/js/content.js"
      ],
      "css": [
        "search_binder/css/search-in.css"
      ]
    }
  ],
  "background": {
    "scripts": [
      "search_binder/background.js"
    ]
  },
  "permissions": [
    "tabs",
    "storage",
    "webRequest",
    "activeTab",
    "unlimitedStorage",
    "https://www.linkedin.com/*",
    "https://www.facebook.com/*",
    "https://vk.com/*",
    "https://twitter.com/*",
    "https://fonts.googleapis.com/*",
    "https://api.catchid.com/*",
    "https://api.idsharks.info/*",
    "https://www.catchid.com/*",
    "https://api.pipl.com/*",
    "https://catchid.com/*",
    "https://github.com/*"
  ],
  "browser_action": {
    "default_title": "SearchBinder",
    "default_icon": "search_binder/icons/icon128x128.png"
  },
  "web_accessible_resources": [
    "search_binder/index.html"
  ]
}