I don’t have any extensions like that - see below for a screenshot and more details.
Right - I should have thought it probably wouldn’t be the same across every browser; but a quick check with Chromium, Firefox and Opera (the browser I use most), the font size seems quite a bit smaller than before - here’s Firefox, for example, on a screen with 1680 x 1050 resolution
It may of course be that a) I just got new varifocal glasses and everything seems smaller ; 2) I also recently had to switch to Linux Mint 19.3 from Manjaro 20, though on the same screens at the same resolutions, so I don’t think that would be the reason - and the font face change did happen immediately after updating the Norns Shield to the latest version.
Thanks for taking the time to look into this. Being able to make the font size for the code window larger would certainly be useful, given 1) above in particular, if it’s at all possible. Zooming in on the browser does work too though, so if it’s not possible at any point it’s liveable with for sure.