Steps to reproduce:
Use the are.na extension from firefox (https://addons.mozilla.org/en-US/firefox/addon/are-na/) or from chrome store. Try using it on a few different sites. The extension appears to not work consistetly. Somtimes clicking the button makes the popup window allowing you to save things appear, sometimes it doest, sometimes it appears in the bottom left edge of the website, being clipped practically rendering it unusable.
Expected behavior:
A popup window should appear below the button allowing you to save things, regardless of the website.
Orion and macOS:
macOS 12.0.1 - Orion Version 0.99.109.1-beta (WebKit 613.1.12)