Examine source code of Scroll to Top Button CM

{
  "manifest_version": 2,
  "name": "Scroll to Top Button",
  "version": "1.3",
  "description": "Adds a floating button to quickly scroll to the top. Smooth, customizable, with shortcut and context menu.",
  "permissions": [
    "storage",
    "activeTab",
    "contextMenus"
  ],
  "icons": {
    "32": "icons/logo_32.png",
    "64": "icons/logo_64.png",
    "128": "icons/logo_128.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "css": [
        "style.css"
      ],
      "run_at": "document_idle"
    }
  ],
  "options_ui": {
    "page": "options.html",
    "open_in_tab": false
  },
  "browser_action": {
    "default_icon": "icons/logo_128.png",
    "default_title": "Scroll to Top Button",
    "default_popup": "options.html"
  },
  "commands": {
    "scroll_to_top_now": {
      "suggested_key": {
        "default": "Alt+Shift+T"
      },
      "description": "Scroll to the top on the current page"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{7f22cd78-2233-4cdc-b8a6-eb4861ddc2df}"
    }
  }
}