Thank you for sharing the detailed feedback and sorry for the inconvenience caused to you.
For Firefox, I would request you to please follow these 2 video tutorials to start.
Actually ChroPath tab was there but it might be hidden on side because of less space, so you to expand it.

https://www.youtube.com/watch?v=NVtb9HN-8Lc&feature

https://www.youtube.com/watch?v=iEamqrmqhHk