Correct, but so is linux itself as seen here, likewise, Microsoft also helps the development of the linux kernel as seen on this Linux Foundation webpage. Sometimes ad services sponsor non ad related projects.

In the case of firefox however, they are funded by google to have it be the default search engine, and not because Firefox itself sells ad spaces. So I dont quite get the point you are making

You may want to take a look at dvorak-intl and or dvorak-alt-intl, which adds the alt-gr layer to type language specific characters