Examine source code of URL Video Incrementer

{
  "manifest_version": 2,
  "name": "URL Video Incrementer",
  "version": "1.0",
  "description": "Increments the number in the video URL and opens it in a new tab.",
  "permissions": [
    "tabs"
  ],
  "browser_action": {
    "default_icon": {
      "48": "icons/next_48.png"
    },
    "default_title": "Next Video"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{a3ac1a5d-fd66-4381-8261-4d87363ce8c1}"
    }
  }
}