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the most widely used web browser at that time

Netscape Navigator was the most widely used web browser at that time and Microsoft had licensed Mosaic to create Internet Explorer 1.0.

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the gateway to the early Web

And Netscape Navigator was the gateway to the early Web for millions of people.

the first commercially successful Web browser

Netscape Navigator was the first commercially successful Web browser.

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the first widely popular Web browser

2011 – Netscape Navigator was the first widely popular Web browser, and when Netscape finally threw in the towel after years of fighting against Microsoft’s Internet Explorer, Internet Explorer made Navigator an open source project.

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the first popular web browser

Netscape Navigator was the first popular web browser, helping to grow the World Wide Web.

the Web browser of the day in the early nineties and Mosaic of course

Netscape Navigator was the Web browser of the day in the early nineties and Mosaic of course, ah well, nostalgia has nostalgia's place.

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the first very popular browser in 1994

Netscape Navigator was the first very popular browser in 1994.

the name of Netscape's web browser from versions 1.0 through 4.8

Netscape Navigator was the name of Netscape's web browser from versions 1.0–4.8.

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one of the first web browsers available to the public

: Netscape Navigator was one of the first web browsers available to the public.

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the most widely used web browser with a market share of around 80%

In 1995 Netscape Navigator was the most widely used web browser with a market share of around 80%.

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