Examine source code of AppAgg Search

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "name": "AppAgg Search",
  "short_name": "AppAgg Search",
  "version": "3.5",
  "manifest_version": 2,
  "description": "Select text. Right click. Search AppAgg for the selected text. Or, Type 'aa' and SPACE in the address bar to search AppAgg site.",
  "author": "AppAgg.com",
  "developer": {
    "name": "AppAgg.com",
    "url": "https://appagg.com"
  },
  "homepage_url": "https://appagg.com",
  "applications": {
    "gecko": {
      "id": "@appaggsearch"
    }
  },
  "omnibox": {
    "keyword": "aa"
  },
  "background": {
    "scripts": [
      "search.js"
    ]
  },
  "icons": {
    "16": "icon16.png",
    "32": "icon32.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "browser_action": {
    "default_icon": "icon128.png",
    "default_title": "AppAgg.com"
  },
  "permissions": [
    "contextMenus"
  ]
}