Examine source code of AutoScroll Pro

{
  "manifest_version": 2,
  "name": "AutoScroll Pro",
  "description": "Smart auto-scroll for PDFs, manga, blogs, and the web",
  "version": "0.2.0",
  "icons": {
    "16": "assets/icons/icon-16.png",
    "32": "assets/icons/icon-32.png",
    "48": "assets/icons/icon-48.png",
    "128": "assets/icons/icon-128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "autoscroll-pro@ruban.dev",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    }
  },
  "permissions": [
    "activeTab",
    "scripting",
    "storage",
    "contextMenus"
  ],
  "commands": {
    "toggle-scroll": {
      "suggested_key": {
        "default": "Alt+S"
      },
      "description": "Start/stop auto-scroll"
    },
    "speed-up": {
      "suggested_key": {
        "default": "Alt+Up"
      },
      "description": "Increase scroll speed"
    },
    "speed-down": {
      "suggested_key": {
        "default": "Alt+Down"
      },
      "description": "Decrease scroll speed"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_title": "AutoScroll Pro",
    "default_popup": "popup.html"
  },
  "options_ui": {
    "open_in_tab": false,
    "page": "options.html"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "run_at": "document_idle",
      "js": [
        "content-scripts/detector.js",
        "content-scripts/scroller.js"
      ]
    },
    {
      "matches": [
        "*://*/*.pdf",
        "*://*/*.pdf?*",
        "*://docs.google.com/viewer*",
        "*://drive.google.com/*/preview*"
      ],
      "run_at": "document_idle",
      "js": [
        "content-scripts/pdf.js"
      ]
    }
  ]
}