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Yeah, that "Go Menu" didn't really make sense to me. I can only find it from my desktop, when I have nothing marked, and it says "finder" in the very top left of my screen. A little bit to the right of that, it says "go". Holding shift while clicking that, or the other command you mentioned, did not result in what you described. BUT!!
I had no idea I could remove those files found by Etrecheck by USING Etrecheck!! So I did the diagnostic again, clicked "security" as you mentioned, and wouldn't you believe it: I could click "remove" next to all those unassigned (and impossible to locate myself!) files within Etrecheck. 🙂 So I did that. From all the other functions I saw within EtreCheck, I though that anything that would "do anything for me" would cost money, but that one remove-unassigned-files-function was FREE.

So I am hopeful now! If everything goes as planned, the problem is now gone. Thanks a bunch.

To summarize for other readers. To find and remove adware:
- Download EtreCheck. Its free, safe, and only takes seconds. Go to www.etrecheck.com.
- Install it, and run a diagnostic (it's what it's for, you'll figure it out.).
- When done, it will shows you the status of your Mac (the "report"), including detected adware and unassigned files (that typically could be adware). You can share this report here in apple forums for help, if you don't understand.
- If the report tells you it has found unassigned files and possible adware, click "security" in the menu on the left.
- Click "remove" next to all unassigned files. DONE!
- PS: An unassigned files is - to my understanding - unassigned in the first place, because it is not from an identified developer. So you can't mess up anything that is from apple and supposed to be on your computer, by deleting these files. It COULD however be related to something else you have downloaded (game, software whatever) that you do want on your computer, that also is from an unidentified developer. So the only danger is related to whatever you might possibly have installed in terms of "other stuff". Or something 😀

Unfortunately, that function doesn't help. I have it enabled.
This very clearly started happened at a distinct time, about a week ago, with both browsers. From googling it, I feel pretty confident I have adware on my Mac. Which takes me back to my original question: does anyone have any troubleshooting tips on how to remove that adware? :/

I might have gotten that type of ad once, but it's not the most common one, no.
And it's not a specific website. I can open up chrome, and simply be on the google search home page (not having gone anywhere, or search for anything, and suddenly a new tab opens with an ad. Same with both browsers.
It can happen while I am checking my gmail, or when I'm on facebook. Or, as said, when I'm "nowhere". As long as the browser is open. Based on this, and the googling I have done, I'm pretty sure it is adware. So if I may direct you to my initial question; do you have any tips on how to remove this?

Clarification:
Ads can open up in a new tab even though I am not viewing any website. Simply as long as any of the browsers are open (from the startup page), ads keep popping up - opening up in new tabs - with a minute or two intervals. Seems completely unafdected by my actual usage of the browsers.
Secondly, I am fairly confident it is adware. I realize I could have stated this clearer. I am hoping for some good tipds on how to find and remove adware. (Unless you recognize what I'm escribing as something else, of course..)

That was very helpful! Thanks. I ran the diagnostic, and it tells me I have adware. But it also refers to where that adware is located on my Mac!
It also tells me I dont have a time machine backup (knew that already of course 😝), and that a game I sometime play causes a hard shutdown/crash. Which it does. So it seems the diagnostic is very thorough, if not anything else. I am in Norway, and I am half asleep now, but I will run with this report tomorrow, and see what I can do. It's definitely enough to have me troubleshooting for hours tomorrow, and if I can't figure it out myself, I will just buy the solution from Etresoft.

Thanks again.

Hi Eric. Thanks for trying to help! I did exacty what you said, and I get the view options open. But nothing in there lets me check anything that says "show Library folder". Instead, i get a few options to "Arrange by", "Sort by", "Icon size", "text size", "Show columns" (with sub options such as date, size, kind etc), a few individual check boxes for icon preview and size calculations, and a button for resetting to default. I know I should have given a screenshot or this, but I'm a noob 8-) Hope at least my descriptions are clear.

And, just to clarify. I CAN find the Library folder. I just don't find the "LaunchAgent" folder within my library, where Etrecheck says that the unassigned files are :/

I am pretty sure I had that selected yes. When in Finder, I clicked *Robert's MacBook Pro" under "Devices" in the menu to the left. Again, and for the record, I can navigate to my Library from here, without any special commands. Its under "SSD" (my harddrive), from *Robert's MacBook Pro*. My main problem is this one folder that is supposed to be within the library folder, that I cannot find.

I have posted the report here in the comments to "cåts". I'll refrain from doing it again, due to the space it takes. I'm sure you'll find it if you expand my comments.
But thanks for the efforts you're putting in. I will try and figure out what and where the "finder go" menu is, and then perhaps your first post makes more sense to me D: