Examine source code of VideoResizer

{
  "manifest_version": 2,
  "name": "VideoResizer",
  "version": "1.2",
  "description": "Resize any video player with a draggable corner. Toggle with toolbar button.",
  "permissions": [
    "tabs",
    "activeTab",
    "storage"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": {
      "32": "icons/icon-32.png",
      "48": "icons/icon-48.png"
    },
    "default_title": "Toggle Video Resizer"
  },
  "icons": {
    "32": "icons/icon-32.png",
    "48": "icons/icon-48.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content-script.js"
      ],
      "css": [
        "style.css"
      ],
      "run_at": "document_idle"
    }
  ],
  "applications": {
    "gecko": {
      "id": "owe@woe.no"
    }
  }
}