Tech experts: How do I get rid of adware without paying anything?

[The world will shine with light in our nightmare]

My mom looked at this issue this morning but it's not getting any better, and I want to give her a break because she's been dealing with computer issues to no end.  While my problems aren't as severe, I'm having an extremely difficult time getting rid of the ads and pop-ups that are appearing on the sites I visit.  I installed the Malwarebytes trial and it picked up a lot of infections, but the problems persisted after I removed them.  Does anyone know of a quick, easy, costless way to get rid of these ads?

The web browser I'm using is Firefox.  I'll provide more information if necessary.

[Antonio the Sixth]

https://adblockplus.org/

It works wonders for me.

[The world will shine with light in our nightmare]

https://adblockplus.org/

It works wonders for me.

Thanks.  So far, so good.  It's not perfect, but the ads that were on the top of the forum page have been replaced by, well, space.

[politicallefty]

As far as infections go, I've found that the free version of SuperAntiSpyware works very well. When it comes to blocking most ads, you have to look for browser-specific solutions.

[tik 🪀✨]

Ooh! I get to be the first wanker to suggest Linux!

Otherwise: AdAware and Spybot: Search & Destroy 2 are my favourites. There are probably better ones these days, I don't know.