Hi, I’m using syncthing on an Ubuntu laptop and previously, it worked fine and opened to firefox. Since I didn’t need it anymore and was using chromium, I uninstalled it. Syncthing does not seem to open the GUI on chrome and returns a “No uPNP device connected” error.
There is also a checkbox “start browser” in the settings. If you’d unchecked that one, it wouldn’t start the browser any more, and resetting to default would revert that indeed.