Examine source code of Container Prompts

{
  "manifest_version": 2,
  "name": "Container Prompts",
  "version": "1.0.1",
  "description": "A Firefox Addon that prompts you to select a Multi-account Container when opening a new tab.",
  "icons": {
    "16": "/icons/new-tab.svg",
    "32": "/icons/new-tab.svg",
    "64": "/icons/new-tab.svg",
    "96": "/icons/new-tab.svg",
    "128": "/icons/new-tab.svg"
  },
  "browser_action": {
    "default_title": "Container Prompts",
    "default_icon": "/icons/new-tab.svg",
    "theme_icons": [
      {
        "light": "/icons/new-tab-light.svg",
        "dark": "/icons/new-tab.svg",
        "size": 16
      },
      {
        "light": "/icons/new-tab-light.svg",
        "dark": "/icons/new-tab.svg",
        "size": 32
      },
      {
        "light": "/icons/new-tab-light.svg",
        "dark": "/icons/new-tab.svg",
        "size": 64
      },
      {
        "light": "/icons/new-tab-light.svg",
        "dark": "/icons/new-tab.svg",
        "size": 96
      },
      {
        "light": "/icons/new-tab-light.svg",
        "dark": "/icons/new-tab.svg",
        "size": 128
      }
    ]
  },
  "permissions": [
    "contextualIdentities",
    "cookies",
    "tabs",
    "scripting"
  ],
  "browser_specific_settings": {
    "gecko": {
      "strict_min_version": "64.0",
      "id": "{7d91fffa-f4b6-4aae-b385-8b3c0aa698ec}"
    }
  },
  "chrome_url_overrides": {
    "newtab": "new-tab-page.html"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content-script.js"
      ]
    }
  ]
}