Many thanks to geek1011, jackie_w, GeoffR and NiLuJe for all of your work - I installed the patches for the latest firmware version and everything is working as it should
One thing I was wondering is if it is possible to alter/reduce the font size of the text in the footnotes popup. I used to install a patch compiled by jcn363 called 'footnotes and alike' (link
here), which worked without being updated up until the latest 4.15.* firmware version, but (as I suspected) it doesn't work anymore. I don't know if it would still be feasible in the newest firmware version?