Jabfox not finishing in a reasonable time

Since I had earlier imported, using JabFox, an entry (10.1016/j.tem.2019.03.005) from Trends in Endocrinolog and Metabolism flawlessly, I tried the same with DOI https://doi.org/10.1016/j.cell.2019.05.011 from Cell. However, I waited 14+ min for this entry import to finish but it did not. The pdf is at least 13 MB to be copied. Is there a reason that this does not finish in let’s say 10 min? My internet access can be as high as 1.6 Mbit/sec. Can this be confirmed by someone else? If yes, I will raise an bug report for JabFox.
The import chokes at “Search for Bibliographic data”.
Regards Bernhard

This morning I imported several entries without problems. The one cited did still not finish. While the “import into JabRef”-button appeared on several articles of the same issue of Nature, https://doi.org/10.1038/s41586-019-1168-5 did not show it. Fairly strange!

Issue #5936