Examine source code of MathML Copy

{
  "manifest_version": 2,
  "name": "MathML Copy",
  "version": "1.3.4resigned1",
  "description": "Add items to the context menu to copy a MathML formula and other annotations attached to it (e.g. LaTeX) into the clipboard.",
  "author": "Frédéric Wang",
  "homepage_url": "https://github.com/fred-wang/webextension-mathml-copy",
  "icons": {
    "32": "icons/icon-32.png",
    "48": "icons/icon-48.png",
    "64": "icons/icon-64.png",
    "96": "icons/icon-96.png"
  },
  "default_locale": "en_US",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "all_frames": true,
      "js": [
        "content-scripts/get-mathml-data.js",
        "content-scripts/set-clipboard-data.js"
      ],
      "run_at": "document_start"
    }
  ],
  "permissions": [
    "contextMenus",
    "clipboardWrite"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "jid1-u5w9ZJYgijZpHA@jetpack"
    }
  }
}