I'm pretty sure my Pentium 3 PC back in the day had 128 or 256MB memory, and I ran tabbed Mozilla/Seamonkey as well as the first versions of Firefox ("Phoenix"), both with tabs. 2003ish.

Cold Phoenix start on Windows XP was similar to Firefox startup today on a Mac :D (ok, maybe a few seconds longer of pegging the CPU)

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pjmlp a day ago | parent [-]

Windows XP was the follow up to Windows 2000.

Yeah, and it took up to 2006 for IE to support tabs.

Anyway, by then Windows 2000 already had its replacements on Windows XP, and Windows Server 2003.

	▲	hobo123 a day ago \| parent [-]
		Mozilla introduced tabs in 2001 and ran on Windows NT and 2000: https://www-archive.mozilla.org/releases/mozilla0.9.5/