Examine source code of Crypt3TR

{
  "manifest_version": 2,
  "name": "Crypt3TR",
  "version": "1.3",
  "description": "Text encryption extension for the web: encrypt your messages on any site with a single password, directly in your browser, with no servers and no data collection.",
  "icons": {
    "32": "/icons/icon-32.png",
    "48": "/icons/icon-48.png",
    "96": "/icons/icon-96.png",
    "128": "/icons/icon-128.png"
  },
  "browser_action": {
    "default_title": "Crypt3TR",
    "default_popup": "popup.html",
    "default_icon": {
      "32": "/icons/icon-32.png",
      "48": "/icons/icon-48.png"
    }
  },
  "permissions": [
    "storage",
    "menus",
    "contextMenus",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "lang.js",
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "lang.js",
        "content-script.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "web_accessible_resources": [
    "viewer.html",
    "viewer.js",
    "editor.html",
    "emoji-data.js",
    "editor.js"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "crypt3tr@invalid",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    }
  }
}