brain-dump/sysadmin/windows/active-directory/block-all-websites-whitelist-specific-urls.md

Block All Websites, Except those Whitelisted Firefox GPO

Using Firefox GPO Templates

My notes are based on a Computer policy, it may be applicable for User-based policies, but not tested.

GPO Policy

Blacklist policy:

• Path:

  Computer Configuration / Policies / Administrative Templates / Mozilla / Firefox / Blocked websites
  

• Value:

  <all_urls>
  

Whitelist policy:

• Path:

  Computer Configuration / Policies / Administrative Templates / Mozilla / Firefox / Exceptions to blocked websites
  

• Value:

  http://example.com/*
  https://example.com/*
  

If this is for a kiosk policy, at the time of writing, Microsoft Edge doesn't offer this capability, so the only option is to block all (until Microsoft has a comparable GPO): Block Microsoft Edge