Donate Your Tab

Awesome idea for a One Pager by Mike Bodge where you hit a switch to start mining cryptocurrency within your browser – all for a cause of your choice. You simply leave your tab open and the site mines Monero (XMR) on your behalf. Lovely touch with the favicon changing when you hit the switch and of course the "mining speed" slider to lower your hashrate if your fan is going nuts.

This website has unfortunately been redesigned or gone offline, so I have removed the direct link to it. The screenshot below hopefully preserved enough of the design but if you are really keen to inspect further, try this Archive.org link. FYI: the site was first featured on 20 October 2017.