Why isn't it "an adblocker"?
I know that it should be a, but why does an feel so better and is an correct in this case?
Why isn't it "an adblocker"?
I know that it should be a, but why does an feel so better and is an correct in this case?
It should be an, because the word "adblocker" begins with a vowel sound (that isn't a long u or y).
Whoever is telling you it should be a is wrong.
Standard English, which is just one dialect of English, would use an before adblocker. So on a test of standard English, you should definitely use an.
However, some native speakers say and even write a adblocker. It's hard to say that this is truly not a standard option (or could not become one), since over time the usages for an have deceased (an used to be used before such words as university and use, but not any more). Language use is always changing.