Hi, possibly related: since upgrading to 112.0, some custom fonts set by websites are no longer rendered.
For example, on https://www.teletal.hu/etlap/16, there is supposed to be a leftmost column of row labels in the table, saying "RE1", "RE2", "A1", "A2" and so on. If the setting "Allow pages to choose their own fonts, instead of your selections above" (browser.display.use_document_fonts) is enabled, these labels are invisible (you can select them and their space will be highlighted, but the letters are not rendered). Disabling use_document_fonts causes the labels to be rendered correctly (in the font chosen in the preferences). The same problem occurs with most text on facebook.com and messenger.com as well. I was able to replicate this with a blank new browser profile, using firefox 112.0-1 and up to date sid as of today. AndrĂ¡s -- I ? Unicode.