Can I "clear up" the audio I'm hearing from a video clip in my browser?

I'm listening to some recording of a talk, which was made with a microphone far from the speaker; there's some noise and perhaps a bit of echo and it's not super clear. Now, if this were just an audio file on my PC, I would (try to) use Audacity which is supposed to be able to help. But - this is a video clip played by some web page on my browser, and I can't (or find it difficult to) download it. Is there a way I could apply some kind of filtering on my outgoing audio to clear it up? My system: Devuan GNU/Linux Excalibur (i.e. Debian Trixie without systemd) on an x86_64, with Cinnamon as the desktop environment. Sound server is pulseaudio.