Safari doesn't have the privacy extensions of Firefox (e.g. uBlock Origin, Privacy Badger, Multi-Account Containers), or custom search keywords. I use Firefox on iOS actually, because I get to sync my custom search keywords.
Also in my experience, while Safari is very efficient in terms of battery, Firefox has made great improvements in that department and also ... Safari chokes on more than 10 open tabs, whereas Firefox runs just fine with at least 10 times more tabs.
Also in my experience, while Safari is very efficient in terms of battery, Firefox has made great improvements in that department and also ... Safari chokes on more than 10 open tabs, whereas Firefox runs just fine with at least 10 times more tabs.