Does not recognize PDFs on many publisher pages (tried tandfonline.com, academic.oup.com, and many others) where the previous version detected them easily.
Does not give the possibility to save a reference and PDF directly from the PDF viewer on the browser, which was possible before if I am not mistaking.
Mendeley is a great tool for researchers but this version of the web importer still needs improvements.

mendeley is at the heart of modernization, unbeatable service

It is not working on some pdf's viewed on firefox. The button don't display anything. For example in https://www.researchgate.net/profile/Peter_Driessen/publication/242097053_Path_Difference_Learning_for_Guitar_Fingering_Problem/links/5460b9d70cf295b5616375b4/Path-Difference-Learning-for-Guitar-Fingering-Problem.pdf

UPDATE
Now if I use Mendeley Web Importer on a PDF the following message appear: "For security, Firefox blocks extensions running on PDF files".

It is a pity that the extension does not work in a browser as good and safe as Firefox. It is time to go back to Chrome again.

Very handy add-on, in addition, it may also help you to get the PDF of the articles as long as you are in your academic internet environment and you have the access right.

Unable to get sign-in. Every time showing same message "sorry" unable to connect. Poor service.

Recent updates have made it work perfectly.

Great app