Examine source code of YouTabMan

{
  "manifest_version": 2,
  "name": "YouTabMan",
  "version": "1.3.3resigned1",
  "description": "A Web Extension used to control all of your YouTube tabs.",
  "browser_action": {
    "default_title": "YouTabMan",
    "default_popup": "index.html",
    "default_icon": "logo.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://www.youtube.com/*"
      ],
      "js": [
        "background.js"
      ]
    }
  ],
  "icons": {
    "128": "logo.png"
  },
  "permissions": [
    "activeTab",
    "tabs",
    "http://*/",
    "https://*/"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{7e7ddc0e-3fb3-41b1-9680-f204c6f29e86}"
    }
  }
}