By “minorities” do you mean all non-French people in his European empire? If that’s the case, his attitude was fairly dogmatic and standard across the board: they all abide by the Napoleonic Code, no exceptions. He intended for his law code to be a universal one, to be applied in the same manner in every part of his empire, and affecting every subject, no matter their religion, ethnicity, or previous privileges. The same laws that bound Catholic Frenchmen would also bind Protestant Germans, as well as Jews. His law code did not discriminate against people based on religion or ethnicity (although it did curtail the rights of women, compared to their elevated status during the French Revolution). Even when the enforcement of the Napoleonic Code was met with opposition in some provinces, most notably Catalonia and Italy, he insisted his administrators force the local governments to accept it. Only in Dalmatia did he compromise with the locals and allow them to keep many of their own cultural norms and legal systems, because of the almost insurmountable linguistic challenges and difficulties in communication and logistics in the mountainous geography.

In every part of his empire, Napoleon wanted the spread of the French language to permeate. All official government roles required staff to speak and write French, and French was taught in all schools. Napoleon wanted French to be what Latin was like during the height of the Roman Empire. Most high ranking government jobs were staffed exclusively by Frenchmen or Savoyards (the only non-French Napoleon trusted), with only a few exceptions made for highly competent and loyal non-French subjects that complied totally with the new regime. Napoleon and many of his generals and administrators held generally negative opinions of many of their ‘foreign’ subjects, especially Italians and Spaniards, and saw them as needing to be forcibly guided into being more French by abandoning age-old “superstitious” (i.e. Catholic) traditions, speaking French in day-to-day life, and accepting the Napoleonic Code enthusiastically. Due to how short-lived the Napoleonic Empire was, the results of this widespread ‘Frenchification’ effort cannot be examined for any general, long-term results.

Source: The Napoleonic Mediterranean: Enlightenment, Revolution and Empire by Michael Broers