Examine source code of Seeing Sprouts

{
  "name": "Seeing Sprouts",
  "version": "0.1",
  "description": "Browser extension that replaces every image with brussel sprouts.",
  "manifest_version": 2,
  "web_accessible_resources": [
    "*.jpg"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "all_frames": true,
      "js": [
        "sproutify.js"
      ]
    }
  ],
  "options_ui": {
    "page": "veggie-selector/options.html"
  },
  "permissions": [
    "storage"
  ],
  "icons": {
    "48": "images/sprouts/icon-sprout-48.png",
    "96": "images/sprouts/icon-sprout-96.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "addon@seeing-sprouts.com",
      "strict_min_version": "53.0"
    }
  }
}