If I have the right zoom level to make the text in the feed a sensible size, the font size in the threads is too small to read easily. Correct the zoom level in the thread and the font size in the feed becomes way too large.

This has long been a problem and I'm not sure why this is suddenly irritating me more than usual. Is it just me? Is there a setting I'm missing?

E2A: It's likely a browser issue. I've found a workaround, thanks all.