Yeah roytam's lesser known builds are kinda hard to find, but finally managed to find them again - Here! :) LINK 1: http://rtfreesoft.blogspot.com/2018/06/other-browser-binaries.html
At bottom of post: Firefox3.6 + TLS1.2 (fx36)
Firefox2 + TLS1.2 (rzbrowser / retrozilla2.1)
And better yet: the archive link!
Can't believe how long it took me to notice, that this folder isn't as locked away as thought for so long, the trick is just: it needs AJAX for the content to show up! LINK 2: http://o.rths.cf/gpc/files1.rt/home.html
There's also Seamonkey + TLS1.2 (rz-suite / retrozilla2.2)