Which browsers does Paperpile support?
Paperpile is fully supported on Chrome for macOS, Windows, Linux and Chrome OS. It also known to run on Microsoft Edge and the open-source Chromium browser.
Paperpile is not just a web app, it uses advanced features of the browser which are only available through the browser extension. Only recently, browser extensions have been standardized and adopted by all major browsers including Firefox and Safari.
So while Paperpile is only available for Chrome, Chromium and Edge at this time, it's on roadmap to provide Paperpile also for Firefox and Safari.