Examine source code of TabZoom (for containers)

{
  "manifest_version": 2,
  "name": "TabZoom",
  "version": "1.8.0",
  "browser_specific_settings": {
    "gecko": {
      "id": "{21e7c6a3-cd3a-4671-bef3-0a4befecbb0c}",
      "strict_min_version": "90.0"
    }
  },
  "options_ui": {
    "page": "options.html",
    "browser_style": true
  },
  "description": "Reduce the tab footprint of non-current containers",
  "icons": {
    "48": "icons/zoom-48.png",
    "96": "icons/zoom-96.png"
  },
  "permissions": [
    "tabs",
    "tabHide",
    "contextualIdentities",
    "storage",
    "cookies"
  ],
  "web_accessible_resources": [
    "placeholder.html",
    "placeholder.js"
  ],
  "browser_action": {
    "default_icon": "icons/zoom-48.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.mozilla.org/*"
      ],
      "js": [
        "tabzoom.js",
        "options.js"
      ]
    }
  ]
}