Examine source code of Can I Use

{
  "name": "Can I Use",
  "manifest_version": 2,
  "permissions": [
    "activeTab"
  ],
  "version": "1.0",
  "browser_action": {
    "default_icon": {
      "19": "logo64.png",
      "38": "logo32.png"
    },
    "default_title": " Can I Use",
    "default_popup": "popup.html"
  },
  "description": "Search HTML, CSS, JS Supported browser",
  "icons": {
    "48": "logo64.png",
    "96": "logo256.png"
  },
  "page_action": {
    "default_icon": {
      "19": "logo64.png",
      "38": "logo32.png"
    },
    "default_title": "Can I Use",
    "default_popup": "popup.html"
  }
}