www.optimum.net - desktop site instead of mobile site

[anonymousbot]

URL: https://www.optimum.net/

Browser / Version: Firefox 84.0
Operating System: Mac OS X 10.14
Tested Another Browser: Yes Chrome

Problem type: Desktop site instead of mobile site
Description: Desktop site instead of mobile site
Steps to Reproduce:

Browser Configuration

• None

From webcompat.com with ❤️

[webcompat-bot]

Original issue 2599