Examine source code of Decoder

{
  "name": "Decoder",
  "description": "An Extension to decode any selected Base64 text",
  "version": "1.4resigned1",
  "manifest_version": 2,
  "browser_action": {
    "default_icon": {
      "16": "images/Decoder_16.png",
      "32": "images/Decoder_32.png",
      "64": "images/Decoder_64.png",
      "128": "images/Decoder_128.png"
    }
  },
  "icons": {
    "16": "images/Decoder_16.png",
    "32": "images/Decoder_32.png",
    "64": "images/Decoder_64.png",
    "128": "images/Decoder_128.png"
  },
  "background": {
    "scripts": [
      "eventPage.js"
    ],
    "persistent": false
  },
  "permissions": [
    "storage",
    "contextMenus",
    "clipboardWrite",
    "tabs"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{bf486303-c2d6-42f4-b4a8-6dcff5df247b}"
    }
  }
}