Examine source code of SaferClipboard

{
  "name": "SaferClipboard",
  "description": "SaferClipboard",
  "version": "1.0.2",
  "icons": {
    "128": "logo.png"
  },
  "author": "Martin Mouterde",
  "content_scripts": [
    {
      "js": [
        "extension.js"
      ],
      "matches": [
        "*://*/*"
      ],
      "run_at": "document_start"
    }
  ],
  "permissions": [
    "clipboardRead",
    "clipboardWrite"
  ],
  "manifest_version": 2
}