Block sites outside container Firefox

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manifest.json
{
  "manifest_version": 2,
  "name": "Block sites outside container",
  "description": "Set up domains so that they aren't allowed to load content except in specific containers",
  "version": "1.5.5",
  "permissions": [
    "<all_urls>",
    "contextualIdentities",
    "cookies",
    "storage",
    "tabs",
    "webRequest",
    "webRequestBlocking"
  ],
  "icons": {
    "96": "block_outside_container.png"
  },
  "applications": {
    "gecko": {
      "id": "block_outside_container@jspenguin.org"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "web_accessible_resources": [
    "block_message.html"
  ],
  "author": "Katie Stafford",
  "developer": {
    "name": "Katie Stafford",
    "url": "https://ktpanda.org/"
  },
  "homepage_url": "https://gitlab.com/ktpanda/block-outside-container",
  "options_ui": {
    "page": "options.html",
    "browser_style": true,
    "open_in_tab": false
  }
}

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