Examine source code of DragOnWeb

{
  "manifest_version": 2,
  "name": "DragOnWeb",
  "version": "2.1.1resigned1",
  "author": "itaj jelodari <iraj.jelo@gmail.com>",
  "description": "Enables dragging scroll on the web pages. to enable or disable the feature just click on the grabbing button in the toolbar>. please see the github page to contribute",
  "homepage_url": "https://github.com/iraj-jelo/drag-on-web",
  "icons": {
    "48": "icons/grabbing-48.png",
    "96": "icons/grabbing-96.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "css": [],
      "js": [
        "js/main.js"
      ],
      "run_at": "document_end"
    }
  ],
  "developer": {
    "name": "iraj jelodari",
    "url": "http://iraj.rocks"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "options_ui": {
    "page": "options/options.html"
  },
  "permissions": [
    "activeTab",
    "tabs",
    "storage",
    "<all_urls>",
    "webRequest"
  ],
  "browser_action": {
    "default_icon": {
      "16": "icons/grabbing-16.png",
      "32": "icons/grabbing-32.png"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{79c32d2f-5269-4cc7-abef-486400a7d6fd}"
    }
  }
}