The Sciwheel Browser Extension lets you quickly save online articles and PDFs while you browse. It will also detect any articles cited in that reference with a DOI or PMID. You can also use it to highlight and make notes on web articles and PDFs that you've saved. It’s available for all major browsers (Chrome, Firefox, Safari, and Edge). You can install it from the TOOLS menu on the Sciwheel site, or by clicking this link:
https://sciwheel.com/work/#/guide/collect
Once installed, it will appear as a Sciwheel icon either to the right of the address bar (for Chrome, Firefox, and Edge) or to the left of the address bar in Safari.