The same team behind Zotero has another newer application called tropy (https://tropy.org/), which is based on Electron, and apparently they were happy with that and are indeed planning to transition Zotero to Electron as well.
The same team behind Zotero has another newer application called tropy (https://tropy.org/), which is based on Electron, and apparently they were happy with that and are indeed planning to transition Zotero to Electron as well.
To add a bit more detail / a slight correction: Zotero did indeed start purely as a Firefox extension, but Zotero Standalone was released in 2011[0], far before the switch to WebExtensions. For a while, the Firefox extension and Zotero standalone were equally featured — i.e. you could use just the Firefox extension, or use Zotero standalone + the Chromium connector extension, and in both cases you'd get the same functionality. After the switch to WebExtensions, the Firefox extension was reduced to being purely a connector, just like the Chromium one.