Examine source code of Encryption Tool

{
  "manifest_version": 3,
  "version": "0.2.9",
  "name": "Encryption Tool",
  "description": "__MSG_description__",
  "default_locale": "en",
  "icons": {
    "16": "data/icons/16.png",
    "32": "data/icons/32.png",
    "48": "data/icons/48.png",
    "64": "data/icons/64.png",
    "128": "data/icons/128.png",
    "256": "data/icons/256.png",
    "512": "data/icons/512.png"
  },
  "permissions": [
    "contextMenus",
    "notifications",
    "storage",
    "activeTab",
    "scripting"
  ],
  "homepage_url": "https://webextension.org/listing/text-encryption-tool.html",
  "background": {
    "service_worker": "worker.js",
    "scripts": [
      "safe.js",
      "context.js",
      "worker.js"
    ]
  },
  "action": {},
  "commands": {
    "_execute_action": {}
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{7a011261-eae1-456c-a6c0-b684127da06e}",
      "strict_min_version": "128.0"
    }
  }
}