Maybe I'm doing something wrong, but I find that Pocket is unable to detect duplicate copies of the same article and prevent them from being added to my list un

Maybe I'm doing something wrong, but I find that Pocket is unable to detect duplicate copies of the same article and prevent them from being added to my list unless they were added from Firefox's landing page, i.e. the "Sponsored by Firefox" and "Recommended by Pocket" sections. Is there something I can do to make Pocket prevent duplicates from being added on the basis of the article's URL alone?