Mozilla (Suite) was similar to Netscape Commumicator and included browser, mail, webpage editor and maybe other functions as well. I don’t recall you could install the components separately. Later they decided to release a standalone browser (Phoenix/Firebird/Firefox) and then mail client (Thunderbird). IIRC they had standalone calendar (Sunbird) and webpage editor as well. Eventually they discontinued Mozilla and the closet thing would be the community-maintained Seamonkey.

I heard from somewhere that you can get the whole collection down to below 120GB if you compress all variants of a game into solid archive.

IIRC they switched to webextensions in Firefox 57 in 2017. Even before that it was never the browser with the biggest market share, and Chrome had already got a huge market share in 2017.

I’ve been using Phoenix/Firebird/Firefox as my default browser since 2003. Never understood the appeal of Chrome.