Examine source code of Speed Ads

{
  "manifest_version": 2,
  "name": "Speed Ads",
  "description": "Auto-adjusts YouTube ads to 16x speed.",
  "version": "1.1",
  "icons": {
    "48": "icon.png"
  },
  "browser_action": {
    "default_icon": "icon.png",
    "default_title": "Speed Ads",
    "default_popup": "popup.html"
  },
  "permissions": [
    "storage",
    "*://*.youtube.com/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://*.youtube.com/*"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "applications": {
    "gecko": {
      "id": "speedads@firefox.com",
      "strict_min_version": "68.0"
    }
  }
}