based on original Communicator code (with layout engine stability and performance enhancements to the 4.0 codebase, codenamed Mariner) and another using the Gecko layout engine.

Though Netscape had originally intended to deploy Mariner and later replace it with Gecko (which had been developed from scratch), Netscape 5 and Mariner were scrapped completely. However, the versions continued to be numbered as if they had been released.

Netscape

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