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Topics - WholeWheatBagels

1
So I've been messing around with Javascript lately.
I wrote this to mess with some page code:

javascript:
var divs = document.getElementsByClassName("corrupted-repair-button");
for (var x = 0; x < divs.length; x++) {
    var elem=divs[x];
    elem.removeAttribute('hidden')
}

What I'm trying to do is remove a "hidden" attribute from an element with that class name.
Thing is, it works in the Inspect console,but when I stick it in a bookmark or the onmibar it never works and I have no idea why.

Pretty new to JS so it's probably staring me straight in the face and I haven't caught it yet.
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