Can I download the data from a webmap made available from leaflet? I am referring to these dataset (https://www.vectorbase.org/popbio/map/), for which I wish to download the data for Europe? Is there a way to import these data into QGIS providing the link of the website?
I would complete (although it can still be known how data come from the server) Spacedman's answer by saying that reverse-engineering the AJAX call to retrieve data with the finest granularity (at the level of each point) would give nothing but an important coding/development stage to accomplish first. Indeed, data aggregation (averaging and so on) is server-sidely performed. Furthermore, no geoJSON format specification adopted here. An example of call being :
May be you should try to contact them ?
That said, the site you reference has a big fat "Downloads" button which is clearly the recommended way to get the data you want rather than trying to reverse engineer their web map system. Use that.