here's a handy little trick i discovered recently.
so say you want to download an image from, say, pinterest. but egads-
you gotta create an account first! what's a boy to do? well, i'll tell you...
you right click and select "inspect", and then click the arrow in the corner of the inspect menu,
then you go and click on the image.
after that, you should be guided to the image in the text area in the inspect menu...
and you'll be able to save the image now!
(should have probably used a non-watermarked image, but hey, an example is an example)
anyway, that's my tutorial. have fun making an extremely popular website slightly miffed!