If you're going to do something in protest, people have to know that you're protesting and that you want them to take an action in support of it.

And if you degrade their service, they won't blame Chrome, they'll blame you.

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.

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.