How can one know that first time viewing a webpage? I just enable some particular websites to run JS because I know that they are indeed interactive web applic

How can one know that first time viewing a webpage? I just enable some particular websites to run JS because I know that they are indeed interactive web applications that I want to (read: have been constrained to) use. Also, most interactive web applications can stay just as interactive even though they were to reduce the amount of JS and CSS libs, fonts, images, icons, videos and other stuff that they thoughtlessly pull in. I disabled fonts loading on webpages and all the search boxes are now an "fl" ligature for me, though many times I see that it's not more cryptic then before I disabled fonts, because weird icons some people invented are just as meaningless to me as random letters. I've gotten used to the fact that an identity sign is for a meny, but every other day someone invents another one that now I can't click anything without fear and uncertainty, as most of the time no-one bothers to put a tooltip or a litte label.