Elsevier pdf grabber not working

Hi, when saving this paper
https://doi.org/10.1016/j.joule.2018.01.017
to Zotero, the pdf is not downloading automatically. Manual pdf download is working though. This is on a Windows 10 (Education) machine (64-bit), Firefox 58 (64-bit), Zotero 5. How can this be fixed? I remember that this problem already occured about a year ago with Elsevier / ScienceDirect journals.
Thanks for help!
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