Examine source code of Clippy

{
  "manifest_version": 2,
  "name": "Clippy",
  "description": "Holds clipboard data for easy access.",
  "version": "1.0",
  "browser_specific_settings": {
    "gecko": {
      "id": "clippy@confluxes.net",
      "strict_min_version": "54.0a1"
    }
  },
  "icons": {
    "96": "icons/Icon.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "sidebar/main.js"
      ]
    }
  ],
  "sidebar_action": {
    "default_icon": "icons/Icon.png",
    "default_title": "Clippy",
    "default_panel": "sidebar/main.html"
  },
  "permissions": [
    "storage",
    "tabs",
    "clipboardRead",
    "clipboardWrite"
  ],
  "commands": {
    "_add_text_to_clippy": {
      "suggested_key": {
        "default": "Alt+X"
      }
    }
  }
}