For proof, send an email to the address on my GitHub user page and I'll fire back and message.
Edit: Some additional clarification. Greasemonkey is developed by a community. The original author is Aaron Boodman, and he left the project several years ago to go work for Google. He gave control of the project to Anthony Lieuallen and Johan Sundström. Anyone can volunteer their time to contribute to Greasemonkey, but the two maintainers ultimately have the say on what will be included in Greasemonkey. I'm a developer who has made a number of contributions and also had my fair share of ideas shot down. I'd be more than willing to go into specifics if anyone cares.