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Well, you could do both :)

"You are using a slow browser, please upgrade to Firefox for a fast experience"

Okay, perhaps that is a bit underhanded, but you get the idea.

I think the "Stop SOPA" banners are a good model. I think people are already suspicious of Google, I don't think they'd need all that much convincing to try switching to Firefox. After a week, at least half will have switched back, but that's just how it goes.

For popups I blame the website developer, I read these as "let me give you a small annoyance to push a personal opinion" => ctrl+w

I think you can tell people other ways that you degraded their experience intentionally. I guess I’m actually fine with popups too. The goal is to make Chrome known as the slow browser so people stop using it.