Try this. For most users it works in FF
Click the menu button and choose Options.Preferences.
Select the Advanced panel.
Select the General tab.
Uncheck Use hardware acceleration when available.
@fallout152
to me, happen that the 2nd mod I choose is the final product.
example: mod 1 gatling lv1 + mod 2 tesla lv 1 -> tesla lv 2
I tried 4/5 times and always had this result.
but dunno if it was only luck.
 "Battle For the Galaxy"){kind=icon}
 "Iron Vice"){kind=icon}
 "Football Saga"){kind=icon}
 "Async Racing"){kind=icon}
 "The Enchanted Cave 2"){kind=icon}
 "Dungeon Rampage"){kind=icon}
 "Pocket Starships"){kind=icon}
 "Mighty Knight"){kind=icon}
 "Astrox"){kind=icon}
Try this. For most users it works in FF Click the menu button and choose Options.Preferences. Select the Advanced panel. Select the General tab. Uncheck Use hardware acceleration when available.