[inetknght]

> Firefox is covered by the Mozilla Public License (MPL), which is a free-as-in-freedom

Firefox is subject to a non-free terms of use.

> What's your definition of freedom?

Let me use the software without limitation.

[creatonez]

This AUP is related to the optional backend services run by Mozilla. The frontends for all of these services are open source, with no usage restrictions. It doesn't affect how Firefox is licensed in terms of copyright. Additionally, the backends for some of these services (such as Firefox Sync and Mozilla Accounts) are fully open source, so you could avoid the AUP if you wanted to.