One reason is that the variety and number of extensions available is far lesser on Safari compared to Firefox. If someone is dependent on several extensions, then it may be a no-go.

It's my daily browser of choice, FWIW, but is no good for development. The React dev tool plugin, for instance, is only available on Chrome & Firefox.

I'm trying to switch to Firefox but it certainly doesn't feel as snappy as Chrome when doing dev work. I do like some of the tools though. Still undecided.

I use Safari for browsing and Chrome for development. Recent changes from Hangouts to Meet has also forced me to use Chrome for video chats.

I've never been a huge extension user (ad blockers and some development tools), so moving to Safari was easy. The big thing I missed was favicons, and those have been in the technology preview for awhile now.

I may explore FF for development, but I'm not sure there is a need since I've already relegated Chrome to a specific task.

This is it. Safari really doesn't compare to chrome/firefox in terms of good developer tools. They are there, but no where near as useful/powerful.

I have noticed a few quirks in Safari that I have to work around. Like not rendering things exactly the same way as chrome/firefox. Bit of a pain, but there is never anything that's really "broken".