localhost8888 - desktop site instead of mobile site

[anonymousbot]

URL: https://localhost8888/

Browser / Version: Firefox 121.0
Operating System: Mac OS X 10.15
Tested Another Browser: Yes Chrome

Problem type: Desktop site instead of mobile site
Description: Desktop site instead of mobile site
Steps to Reproduce:
OK, now the vital part!
Please describe what happ

View the screenshot

Browser Configuration

• gfx.webrender.all: true
• buildID: 20231116093942
• channel: nightly
• hasTouchScreen: false
• mixed active content blocked: false
• mixed passive content blocked: false
• tracking content blocked: false

View console log messages

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[webcompat-bot]

Original issue 2911