I dunno how it affects forks, but considering Google’s TOS doesn’t seem to affect other Chromium projects that much. I doubt it’s a big of a deal for FF forks.
Hell, I’m 99% sure I’m overreacting about Mozilla’s working to begin with. It just made me want to explore alternatives.
Here’s the quote I’m talking about(it has since been changed)
When you upload or input information through Firefox, you hereby grant us a nonexclusive, royalty-free, worldwide license to use that information to help you navigate, experience, and interact with online content as you indicate with your use of Firefox.
You’re right, I know nothing about IP law.
However, I came here to ask for information about using a chromium browser, not a discussion about Mozilla’s choice of words in a TOS.