No pdf saved with connector button
I used to include references and pdf documents automatically with one click on the Zotero Connector button in firefox, which was great. Since two weeks, the button doesn't allow me anymore to save the pdf directly. The reference is still included in my database, but the pdf is not, even though I have access to it on the webpage. Tried to update both zotero, the connector and some other stuff to troubleshoot but I can't fix it.
The url that causes problems is for example http://www.sciencedirect.com/science/article/pii/S2095311916614284.
Problem is that I use sciencedirect a lot. Wiley doesn't give the problem! I just didn't check which websites do and which don't.
https://forums.zotero.org/discussion/comment/285189#Comment_285189
(@bwiernik The linked discussion is IMO not the same issue as here.)