Its a simple thing, I love opera on my PC but Im also a hardcore macbook user.
Currenlty I use opera on my PC and Crome on my mac for the soul reason that theres no option to more the close tab button to the right of the tabs like on the PC version of Opera. If this little change was made it would become my one and only browser but till then I neglect to use it on mac. A simple change Id love to see as a customize option.