Language packs: En + Pl (example page that is affected: onet.pl)
In safe-mode: I'll try it soon and write in another comment (I have to close firefox to do so :) ).
If I chose from menu: Edit -> Preferences -> Content -> Fonts/Advanced -> uncheck Allow (...) then all text is displayed on all pages but the fonts are different from what they should be (Firefox uses only default fonts - serif, sans serif etc.).
Language packs: En + Pl (example page that is affected: onet.pl)
In safe-mode: I'll try it soon and write in another comment (I have to close firefox to do so :) ).
If I chose from menu: Edit -> Preferences -> Content -> Fonts/Advanced -> uncheck Allow (...) then all text is displayed on all pages but the fonts are different from what they should be (Firefox uses only default fonts - serif, sans serif etc.).