[greggyb]

And on the other hand, I'm running a 12" notebook at 1080p with no scaling, and I find the text to be exactly the right size. If anything, I'm tempted to zoom in a notch or two.

Zooming on the web is a critical feature to me. I find pages all the time with nearly unreadably small text, and occasionally with text too large for me. Firefox remembers zoom levels for me, so I only have to adjust once per site, usually.

This is not meant to be a criticism, just sharing another experience for your awareness. Based on your comment, I don't think the author could make both of us simultaneously happy.

[bearbin]

If you find yourself zooming in to new websites more often than not, it's possible to set the default zoom level in firefox. In about:config, set "layout.css.devPixelsPerPx" to the decimal zoom level you want. It will also grow the UI scale but you can reduce that by setting it to "compact" mode in the Customise menu.

[c0vfefe]

think you could make yourself happy, by selecting a screen & scaling that allows default sizes to be readable. If I browsed from a Blackberry on a selfie stick, the onus wouldn't be on the developer to make me happy.