Examine source code of Simply Copy-Paste Notepad

{
  "manifest_version": 2,
  "name": "Simple Copy-Paste Notepad",
  "version": "1.0",
  "description": "A simple Copy-Paste Notepad for making copy-pasting the same thing easy. Saves text values and allows you to copy them to the clipboard.",
  "icons": {
    "48": "icon.png"
  },
  "permissions": [
    "activeTab",
    "storage"
  ],
  "browser_action": {
    "default_popup": "popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{3ad2eeac-bf6f-4d5a-afef-f1a518395dae}"
    }
  }
}