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Re: @0xC0FFEEC0DE:
Out of curiosity I checked on a clean chrome and it actually works.
I have disabled all other extensions, even reinstalled Tampermonkey, but it still did not work.
Deleting all Google cookies has corrected this problem (it's strange a bit, because another script worked well).
Sorry for the confusion.
Thank you for this script.
It no longer displays the button. Please, fix it.