My pick would be, dealing with the ‘wild west’ atmosphere. That being, before cyber bullying laws existed, you had bunches of people getting off scot-free with telling you to off yourself or call you a list of derogatory terms.
Pop up ads. You’d be on a webpage and suddenly you’d be in a completely different browser window and had to x out of that one. And the next one. And the next one. And so on.
“Pop-up blocking” was originally found only in minority web browsers like iCab and Opera. Netscape didn’t want to include it at first, because Netscape was dedicated to the commercialization of the web.
Which is ironic because Firefox (Netscape’s descendent) is the better one and Opera is chromium based, which is developed by Google, an ad-supported company that isn’t so keen on continuing to allow browsers to block them.
Opera didn’t use chromium back then.
Chrome was kind of late to the web browsers market.
Opera was initially released on 10 April 1995, making it one of the oldest desktop web browsers still actively developed. It was commercial software for its first ten years and had its own proprietary layout engine, Presto. In 2013, it switched from the Presto engine to Chromium.
Google Chrome blocks pop-ups too. Google does not allow its own ads to be shown in pop-ups; this is a term of service of the AdSense product.