can I get adblock without having Chrome?

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I'm having trouble locating that indefinitely free adblock site I hear about.
Let me rephrase that a bit......I think I found 1 but it says "you need chrome or safari" (or words to that effect). I don't WANT another darn add-on or tool bar on my screen. I like the one I have, and don't need another clogging up my screen. Is there a way to get that adblock without any more "add this to your screen" shhhhugar? Or can I just disable the added toolbar after I download the one I found without affecting the adblock operation itself?
....The one I had was, I just found out, a "30 day free trial". I thought (and was told) this was free, period. Is that site that charges for it a scam?