This is a great cause. Just one concern: I understand the desire to quantify the difference you're making in the world, but seeing the counter that (currently) says "66 redirects have been made with this extension!" actually influenced me to not install the extension. It seems like the implementation of that could easily leak the list of things I look at on Amazon to you or others, and it shouldn't need to "phone home" like that to function as an extension. If you remove that you'll have another happy giver. :)