Examine source code of AutoScrollium

{
  "manifest_version": 2,
  "name": "Auto Scroll",
  "version": "1.0",
  "description": "Toggle smooth auto scrolling with speed cycling",
  "permissions": [
    "activeTab"
  ],
  "browser_specific_settings": {
    "gecko": {
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      },
      "id": "{5aa65914-6dd5-4f73-a09f-25b32681e594}"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_title": "Auto Scroll"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle"
    }
  ]
}