Examine source code of Image Snatcher

{
  "manifest_version": 2,
  "name": "Image action",
  "version": "2.2",
  "description": "Adds image actions",
  "browser_specific_settings": {
    "gecko": {
      "id": "{dcb2b3d1-cd50-4fec-8d3d-c9eddbe7d0dd}",
      "strict_min_version": "98.0"
    }
  },
  "permissions": [
    "storage",
    "tabs",
    "*://*.doserverless.co/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "helpers/options.js",
        "imageAction.js"
      ]
    }
  ],
  "options_ui": {
    "page": "options.html"
  }
}