Hi James

That is currently not an option in Firefox Preview, but is something that may be included in a future update.

But this feature was super useful!! I'm a graduate researcher and sometimes it was a lifesaver to have the possibility of saving an interesting article to read later,etc. maybe sometimes just to save the bibliographical info of a certain source... Now almost every Pdf reader app wants to charge for this feature... I'll rather pay Firefox than some fishy not so trusty app...also one has to give access to those apps storage permission access...so could you please seriously think on adding this feature again? I would be forever grateful BDMA

Change to google chrome.