Examine source code of Copy Selected Links

{
  "manifest_version": 2,
  "applications": {
    "gecko": {
      "id": "jid1-vs5odTmtIydjMg@jetpack"
    }
  },
  "name": "Copy Selected Links",
  "short_name": "CSL",
  "version": "2.4.1",
  "description": "Right-click selected text to copy the URL of any links it contains.",
  "author": "marnick.leau@gmail.com",
  "icons": {
    "16": "images/icon-16.png",
    "48": "images/icon-48.png",
    "128": "images/icon-128.png"
  },
  "options_ui": {
    "page": "options.html",
    "chrome_style": true
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "permissions": [
    "notifications",
    "contextMenus",
    "storage",
    "activeTab"
  ],
  "commands": {
    "copy-selected-links": {
      "suggested_key": {
        "default": "Alt+Shift+C"
      },
      "description": "Copy the currently selected links."
    }
  }
}