Can't save PDF to zotero from chrome connector

Hi,
I'm using the chrome zotero connector and it normally works great. However I've noticed that most PDFs I try to save using the connector aren't saved. If I click on the extension, nothing happens. When I right click the extension and click add to zotero nothing happens as well. I made sure to view the PDFs through the browser and not download them but it's still not working. (Example for PDF that I can't save https://www.sigmaaldrich.com/IL/en/sds/sigald/179124?userType=undefined).
What can I do to fix this?
Thank you in advance
  • That site is doing some weird things to prevent automated access. It's actually working for me in Firefox while failing in Chrome, so we'll look into that, but that shouldn't be a general problem on other sites.
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