Examine source code of Upwards - Back to Top + PitStops

{
  "name": "Upwards - Back to Top Button + PitStops",
  "description": "Back to Top Everywhere + PitStops.",
  "version": "2.5.6",
  "manifest_version": 2,
  "permissions": [
    "tabs",
    "<all_urls>",
    "storage"
  ],
  "icons": {
    "16": "images/icon_16.png",
    "32": "images/icon_32.png",
    "48": "images/icon_48.png",
    "128": "images/icon_128.png"
  },
  "browser_action": {
    "default_popup": "options.html",
    "default_icon": {
      "16": "images/icon_16.png",
      "32": "images/icon_32.png",
      "48": "images/icon_48.png",
      "128": "images/icon_128.png"
    }
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{6c689767-6b6e-4e63-9e53-6b775666e042}"
    }
  },
  "web_accessible_resources": [
    "back_to_top_rounded.png"
  ]
}