Examine source code of Scroll to Element

{
  "manifest_version": 2,
  "name": "Scroll to Element",
  "description": "Adds a context menu item that scrolls to the element under the cursor.",
  "version": "0.1",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "menus",
    "activeTab"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{9fa5d9f7-a65c-45e3-b5b3-9657dd8bc632}"
    }
  }
}