Hi @_developer_12 ,
I have added a check for Mozilla as given in their documentation.
Please take a look on this pull request,
https://github.com/bagisto/bagisto/pull/3758.
Note: If you want to test the mobile in Mozilla you need to activate the user agent by selecting mobile device from the dropdown as in responsive case it will give web agent but if you check chrome it by default give mobile user agent.
In chrome by default all user agent are comming,
Screenshot from 2020-08-14 12-55-08.png
In Mozilla only web user agent is coming,
Screenshot from 2020-08-14 12-58-21.png
But see when i change the user agent to GalaxyS9 in mozilla,
Screenshot from 2020-08-14 13-01-22.png
Please check and let me know.