Email was the only other useful part. Thunderbird is not exactly dead, just forgotten. I still run it, since I de-googled, though sadly it's also turning into bloatware.

Netscape had a chat thing, html publisher, and I think something else.

WebRTC, pocket, the webIDE, even things like the dom inspector, style editor etc and pdf are bloat for most mortals. Perfect for some "official" plugins. They managed it for the FF OS simulator.

It's all optional crap that increases bloat and attack surface, except it's not optional.