Ok, I suggest that you install the "Stoutner, privacy browser", which treats seeing text, as the default, with the ability to allow other content as optional, though certain sites that are still hand coded, show, as they always have....adds and all.
Sorry, but adblock is a genuine quality of life hack for everyone online. Since you don't want to install anything, how about working at the DNS level and/or hosts level? https://adguard-dns.io/en/welcome.html will change your mind. https://github.com/Ultimate-Hosts-Blacklist is another option for doing it in the hosts file.