Thanks for the explanation. It’s true that Mac users are used to closing apps and folders from the left, but that works because app-level window controls are different, they’re larger, used less frequently, and placed in a spacious area.
Browser tabs are a different story. When you have lots of tabs open, space gets tight. Moving the close (X) icon to the left breaks the muscle memory many users have built up(I've seen many users complaining about the same thing). It makes something that should be quick and easy feel slower and more frustrating.
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