Adding an option for natural scrolling—that is, swiping left to go right and right to go left—on the tab bar would be a nice quality-of-life improvement. I use natural scrolling on my desktop, and most mobile interfaces are designed around it, so not having the option in the iOS Brave browser feels jarring when navigating between tabs. I often forget that only reverse scrolling is available and end up switching to the wrong tab by mistake.
There is the option to scroll tabs using the bottom bar, rather than the tab bar.
Swipe as you please, left or right on the bottom bar:
< (> or share button) (+ or mag glass) [#] ...
Hope this helps and let me know if I just blew your mind 
EDIT: Actually re-reading your post I think you might be thinking of/wanting something else, the “reverse” swiping, to put it another way. Sorry if the above doesn’t help.