Firefox Send is a web-based tool to quickly and easily share self-destructing files. It turns out a lot of users of the service are not using Firefox, which means it might offer an opportunity to convince non-Fx users to try the world's greatest browser.
I was tasked with coming up with some experiment options we will also A/B test. I played around with notification bars, in-page content blocks, footer links, and logos. The experiments will be running soon, so check out Firefox Send and let me know if any Firefox promotion UI shows up for you!