Examine source code of greenl

{
  "browser_action": {
    "browser_style": true,
    "default_title": "greenl",
    "default_popup": "ui/popup/popup.html",
    "default_icon": {
      "48": "icons/seed-48.png"
    }
  },
  "manifest_version": 2,
  "name": "greenl",
  "version": "1.2",
  "description": "Mit jedem Einkauf Umweltprojekte untersützen!",
  "icons": {
    "48": "icons/seed-48.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "it@greenl.de",
      "strict_min_version": "57.0"
    }
  },
  "permissions": [
    "tabs",
    "notifications",
    "activeTab",
    "<all_urls>",
    "storage"
  ],
  "options_ui": {
    "page": "ui/settings/settings.html"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "ui/slider/greenl-slider.js"
      ]
    }
  ],
  "web_accessible_resources": [
    "resources/logo.png",
    "ui/slider/greenl-slider.html",
    "tailwind-output.css"
  ],
  "background": {
    "scripts": [
      "greenl-background.js"
    ]
  }
}