Examine source code of Image Searcher

{
  "manifest_version": 2,
  "name": "Image Searcher",
  "version": "1.12",
  "description": "Allows selecting an area of the page to do a reverse image search.",
  "icons": {
    "48": "icons/border-48.png"
  },
  "permissions": [
    "<all_urls>",
    "tabs",
    "clipboardRead",
    "clipboardWrite"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "reverse-image.js"
      ]
    },
    {
      "matches": [
        "https://yandex.com/images/"
      ],
      "js": [
        "yandex.js"
      ]
    }
  ],
  "background": {
    "scripts": [
      "bg.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{c0b3d6ca-2fe7-4497-859d-06af5a755595}"
    }
  }
}