Examine source code of B64 Coder Pro

{
  "manifest_version": 2,
  "name": "B64 Coder Pro",
  "version": "1.2.1",
  "description": "Fast Base64 encoder decoder with URL-safe and copy modes",
  "browser_specific_settings": {
    "gecko": {
      "id": "{b4229426-47f5-4947-8210-69409294e4db}",
      "strict_min_version": "96.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "icons": {
    "16": "icons/size16.png",
    "32": "icons/size32.png",
    "48": "icons/size48.png",
    "96": "icons/size96.png",
    "128": "icons/size128.png"
  },
  "browser_action": {
    "default_popup": "view/popup.html",
    "default_icon": {
      "16": "icons/size16.png",
      "32": "icons/size32.png",
      "48": "icons/size48.png",
      "96": "icons/size96.png",
      "128": "icons/size128.png"
    }
  },
  "background": {
    "scripts": [
      "background/run.js"
    ]
  },
  "permissions": []
}