This does not happen if Zotero Desktop is not minimised, i.e. just opening Firefox on top of Zotero Desktop.

Hum, I have a more general issue with my current profile in Firefox, as import fails now with previously successfully imported items (metadata + PDF). I just tried to import the URL in the OP in a new

I am now on my university network. I have tried with Firefox and Chrome.

Meanwhile, I have tried through my home network (no VPN). It still does not work with Firefox (139.0.1, all ad-blocking extensions disabled, standard tracking protection). BUT, it works with Chrome (1

Zotero connector (5.0.167beta2) in Firefox (139.0.1) is able to retrieve metadata but fails to download the pdf. Here is an example URL: https://wires.onlinelibrary.wiley.com/doi/10.1002/wcc.70008

Does it work with Chrome? Can you provide a Debug ID for an atempt to save from Firefox that fails?

Since a couple weeks ago, the Zotero extension on Mozilla Firefox stopped working when trying to "Save to Zotero (PDF)" for articles from scientific journals, e.g. APS Physical Review journals. I get

Now, could you check if there’s any slowdown when viewing the same PDF in the Zotero Web Library using Firefox?

I am not having issues with any other PDF-Viewing software on my Laptop, including the built-in Firefox reader, Okular, Apple's Preview or Chrome.

@YanWittmannHSMA Just to confirm — you’re not experiencing any slowdown in Firefox’s built-in PDF.js reader? (Since Zotero uses the same engine.)

I tried to add this [paper](https://dl.acm.org/doi/pdf/10.1145/3236024.3264830) into my local zotero app via the zotero connector on firefox, but fails.

@ghostagw: As explained above, some ports are just blocked in current versions of Firefox/Zotero. It has nothing to do with your security software or firewall. Change your server to use a different po

Yes, try with Chrome if it's working with Firefox. Provide a Debug ID from Chrome if it doesn't work.

my firefox client auto updated before i tried, and during the test, Zotero Connector worked and save the pdf successfully, thus the bug seems to be saved, do you still need the headers with 200 status

Could you do the following in Firefox:

If you see a file:// URL, Firefox is set to download PDFs instead of showing them directly, and the Zotero Connector won't be able to run.

Firefox 139, Zotero Connector 5.0.166, Zotero 7.1-beta.36+1eacc8bbd

Could you install the Zotero Connector Firefox Beta and see if the issue still occurs with it (or something else happens, and produce another Debug ID)?

I'm having trouble using the Zotero Connector on Firefox (Mac) to download PDFs specifically from ScienceDirect. The CAPTCHA does appear, but no matter how many times I click "Confirm you are human,"

For the week or two I haven't been able to download any pdfs to Zotero from either firefox or chrome. Instead, I manually attach pdfs after downloading them via a browser interface.