Examine source code of YouSkip

{
  "name": "YouSkip",
  "version": "1.2resigned1",
  "description": "Skip YouTube ads. (Sorry YouTube)",
  "permissions": [
    "activeTab",
    "storage",
    "https://felisphasma.com/projects/YouSkip/count.php"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://www.youtube.com/watch?*",
        "https://youtube.com/watch?*"
      ],
      "all_frames": true,
      "js": [
        "app.js"
      ],
      "css": [
        "style.css"
      ]
    }
  ],
  "browser_action": {
    "default_icon": {
      "16": "16.png",
      "24": "24.png",
      "32": "32.png",
      "64": "64.png",
      "128": "128.png"
    },
    "default_popup": "popup.html"
  },
  "icons": {
    "16": "16.png",
    "24": "24.png",
    "32": "32.png",
    "64": "64.png",
    "128": "128.png"
  },
  "applications": {
    "gecko": {
      "id": "gmail@felisphasma.com"
    }
  },
  "manifest_version": 2
}