@leocg Not an extension.
Fortunately, I have found the problem after removing all the extensions. Apparently, it was a problem with the "Forced Darm Mode". After turning it off the search results went back to normal.

Your answer did help me find the problem!
Thank you for your time.

So, I just installed Opera GX and I am loving it. However, when I search for something on google the results appear in pink. I can´t tell which links I had already opened.
I have been looking for a way to change this, but can´t seem to find a solution. I tried to reinstall it and the problem is still there. I tried the regular Opera browser and I haven´t had the same problem, so I think it has something to do with the GX.
I have, as well, installed the GX on my phone and the results are not pink.
I would appreciate if someone could help me out.