Examine source code of VirusTotal Search

{
  "manifest_version": 2,
  "name": "VirusTotal Search",
  "description": "Search for selection on VirusTotal",
  "version": "1.0.3resigned1",
  "applications": {
    "gecko": {
      "id": "vtsearch0000000@0000",
      "strict_min_version": "54.0"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "permissions": [
    "contextMenus",
    "clipboardRead",
    "<all_urls>"
  ]
}