> Contributions go to the Mozilla Foundation, a 501(c)(3) organization based in Mountain View, California, to be used in its discretion for its charitable purposes.

I've read about this before I think, for some reason donations cannot be used for development and has to be used for outreach etc?

All it means is that they can use the funds as they see fit. There should be a breakdown somewhere on their site of what % of funds go toward development verse admin/fundraising as they are a 501c3.

This is correct. The best way to support Mozilla products is to use them.

Yeah but I have to go remember to do it and stuff. Meanwhile at ArsTechnica.com, it shows a big banner telling me to subscribe, and I do. More reminders that I can give money to Mozilla would remind me to do it. Eventually they'd hit me at the right time/place to put in the effort to set up a sub, and I would.