I couldn’t understand what is the context of Browser until I read the first usage example with the line “Mozilla/5.0…”. I immediately understood that this is a user-agent parsing library.
I would prefer user-agent which is a well understood term.
I know there's a PHP package of the same name. I wouldn't be surprised if there were other packages of the same name and maybe it's just a namesake that continues.
I would prefer user-agent which is a well understood term.