I looked at the rules and it says:
Labeling not required:
Streams containing informational or educational content that aim to share knowledge in a neutral, fact-based manner, rather than engaging in any kind of advocacy for an issue or candidate. For example, sharing the history of how votes in the US presidential election are counted to determine the next President, or merely encouraging individuals to vote or register to vote.
So saying for example Trump is a homophobic fascist should be allowed
Privacy wise it very much is still Firefox with different defaults (telemetry disabled, do not track enabled), the changes to upstream are mainly the UI and some performance enhancements