I recall Ruffle having an issue with opening links before, but it worked for me just now on the latest version of Firefox, so not sure. You can try using a different browser, but a more reliable way might be to change your settings to use Newgrounds Player instead.
See my news post with medal hunting links and tools. I made a program NGMedals that finds your statistics and unearned medals.
There is also a browser script.
Maintainer of the Top Medal Point Users List and API Mod - feel free to PM with any issues.