Examine source code of IP Webcam Width Adjuster

{
  "manifest_version": 2,
  "name": "IP Webcam Width Adjuster",
  "version": "1.1",
  "description": "Changes the width on screen of the IP webcam",
  "author": "Matthew Zirbel",
  "permissions": [
    "<all_urls>"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "browser_action": {
    "default_icon": "icon.jpg"
  }
}