Examine source code of Scroll to Top (Android)

{
  "manifest_version": 2,
  "name": "Scroll to Top (Android)",
  "short_name": "STT",
  "author": "refried",
  "version": "0.4",
  "description": "Floating arrow button that jumps to the top or bottom of the page.",
  "permissions": [
    "storage",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_title": "Scroll to Top (Android)"
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_end"
    }
  ],
  "icons": {
    "48": "icons/bup.png",
    "96": "icons/bup.png"
  },
  "web_accessible_resources": [
    "icons/bdn.png",
    "icons/bup.png",
    "icons/wdn.png",
    "icons/wup.png",
    "icons/bdn_o.png",
    "icons/bup_o.png",
    "icons/wdn_o.png",
    "icons/wup_o.png"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "scroll-to-top-android@example.local",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    }
  }
}