Examine source code of One-Click Select & Copy

{
  "manifest_version": 2,
  "name": "One-Click Select & Copy",
  "version": "1.8",
  "description": "Use shortcut key + one click to select or copy a word, sentence/line, or paragraph on any webpage.",
  "browser_specific_settings": {
    "gecko": {
      "id": "one-click-select-copy@mywebfix.com",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "storage",
    "clipboardWrite",
    "<all_urls>"
  ],
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_start"
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "options_ui": {
    "page": "options.html",
    "browser_style": false
  },
  "browser_action": {
    "default_title": "One-Click Select & Copy",
    "default_icon": {
      "16": "icons/icon16.png",
      "48": "icons/icon48.png"
    }
  }
}