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Netscape was pushed off a cliff on July 15, 2003

On July 15, 2003, Time Warner quietly slipped a knife into the venerable Netscape browser, killing it off.

In it’s place Time Warner spun off what was left of the web development team and created Mozilla. 

On July 15, 2003, AOL Time Warner gave Netscape the axe, disbanding the company that had started the dot-com boom with its incredible IPO in 1995. Virtually all the engineers were laid off, and the Netscape product suite was discontinued (though a handful of products remained in a kind of maintenance mode, and the Netscape brand was slapped onto a news aggregation site in 2006). It was the end of an era.
https://www.mentalfloss.com/culture/internet/day-2003-netscape-went-offline-forever

Alas, there are no stamps featuring Netscape Navigator. Instead, here’s a stamp representing a far more complex view of the World Wide Web. 

Netscape Navigator - World Wide Web

World Wide Web
Issued by Royal Mail in 2015 as
Part of their Inventive Britain set
Designer: GBH

To be fair, the end had been coming since the software was purchased by AOL (Time Warner) in 1998. Netscape slowly lost it’s edge and was quickly left behind by newer browsers that were leaner, less buggy and could deal with the rapidly changing HTML landscape. 

Previous SODs in case you need another fix: 

Rosetta Stone uncovered in Egypt on July 15 1799

Mount Bandai errupts