I went straight from Mozilla Navigator to Firefox 1.0.
Tabs were such a crazy new thing back then. You would show tabbed browsing to someone (rather than opening new windows) and they thought you were a wizard. IE5 didn’t have tabs, so nerds moved to Mozilla/Firefox. Then IE6 came out but still didn’t have tabs. By the time IE7 came out, I’d had tabbed browsing for 5+ years.
I had the crappiest of PCs in 2006 or 2007 with 768MBs of RAM running Windows XP. Funnily enough the reason I switched to Chrome back then was the immense RAM usage of Firefox compared to Chrome back then. With the big rebranding an rerelease of Firefox in 2017? 2018? I came back and haven’t looked back since.