- Can you legally advertise a product you're not affiliated with? Is this OK by the ToS of major ad networks?
- Is it possible to target ads by user's browser?
I'm thinking, maybe we should crowdfund a public interest ad, targeted at people browsing from Chrome, with some attention-grabbing art or distracting colors, and a clear message: "Want to stop seeing this ad? Stop using Chrome, install a different browser and an ad blocker. Click here to learn more.", which links to a site directing people to install Firefox and uBlock Origin (and linking to crowdfunding campaign to keep the ad going). Alternative for A/B testing: "Don't click this ad, it costs us money."
Come to think of it, maybe someone like EFF should do that - they're well-known and reputable enough that people wouldn't immediately assume it's some weird Firefox ad, avoiding the effect being the opposite from intended.