>> Let’s face it, Safari between Mac and iPhone is a sublime experience.

I daily drive safari and firefox has a far better sync experience. Safari will randomly delay syncing, i've never had that with firefox. I regularly quickly search something on a tab on phone to be picked up later at my desk. It's not a reliable sync process.

Bookmark management? Firefox wins as soon as you want to do something a bit custom because you have so many bookmarks.

Dev tools? You guessed it.

Safari is still better on battery life though.