Opera definitely had them around that time

On Windows XP.

Opera supported win 2000 until 2010s. Same for Firefox which had tabs in its version 1.0 in 2004.

Might be, however the comment I replied to implied any browser on Windows 2000.

And? I never said Opera invented tabs (I knew they didn't).

	▲	pjmlp a day ago \| parent [-]
		And it wasn't on Windows 2000 heyday.