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Yes, well, kind of. Opera had Multiple Document Interface (MDI) which was actually (back then) far more flexible than tabs. But yes, Opera was first with MDI, a

by Fnoord 1mo ago

Yes, well, kind of. Opera had Multiple Document Interface (MDI) which was actually (back then) far more flexible than tabs. But yes, Opera was first with MDI, and also I suppose the first web browser for the smartphone.