Examine source code of Emoji Cheatsheet

{
  "manifest_version": 2,
  "name": "Emoji Cheatsheet for GitHub, Basecamp etc.",
  "short_name": "Emoji Helper",
  "description": "A very simple and useful reference for the codes that can be used to generate Emojis on popular sites like GitHub or Basecamp.",
  "version": "2.0.2resigned1",
  "icons": {
    "32": "icon32.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "author": "Johann Hofmann",
  "offline_enabled": true,
  "permissions": [
    "clipboardWrite",
    "activeTab",
    "storage"
  ],
  "browser_action": {
    "default_icon": "icon48.png",
    "default_popup": "popup.html"
  },
  "commands": {
    "_execute_browser_action": {
      "suggested_key": {
        "default": "Ctrl+Shift+E"
      }
    }
  },
  "minimum_chrome_version": "41",
  "browser_specific_settings": {
    "gecko": {
      "id": "jid1-Xo5SuA6qc1DFpw@jetpack"
    }
  }
}