Can’t blame Mozilla for trying to find a revenue stream so that they don’t go bust.

I personally don’t think this elevates Firefox to spyware / adware status. It also seems easy to disable.

The search engine deals that make money for Mozilla again steer users to one search engine or the other and their massive ads infrastructure. Suggestions in address bar is just doing it without the intermediary search engine. If you don’t like you can disable. I will label a program adware/spyware if a feature is extremely mischievous and/or tough to disable — this one is neither.