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First browser was Netscape who had extensions:
The original API was NPAPI. It was first developed for Netscape browsers, starting in 1995 with Netscape Navigator 2.0, but was subsequently adopted by other browsers. — Preceding unsigned comment added by 130.83.197.103 (talk) 11:22, 18 December 2017 (UTC)[reply]
Those were plug-ins, not extensions, as explained in the article for a few years now (but not in 2017 when this was posted). -Pmffl (talk) 15:32, 6 June 2023 (UTC)[reply]