On Firefox I use the uBlock Origin plug-in, looking at the stats it has blocked 367,682 adverts or 15% of traffic, some sites won't work if you have an ad-blocker. Even works with ITV Player (or whatever its name is today) removing the ad breaks.
On Opera an ad-block (and free VPN) is built in.
I have no objection at all to simple adverts being placed at the top of a page or down the side, I have a huge objection to dynamic adverts that not only slow things down enormously but grossly interfere with your normal browsing.
It scares the life out of me when I switch off my ad-blockers, many pages become virtually unusable and remind me of some torture techniques