Hey! I've been following the Keybase for some time and I really like the idea behind this project.
I installed the extension in my browser and now whenever I hit the "keybase chat" button I get the message "You need the Keybase app to send chat messages." The keybase desktop app obviously runs fine in the background.
Browser: Version 58.0.3029.110 Built on Ubuntu, running on Ubuntu 17.04 (64-bit)
Btw: Would you consider putting the Android app on F-Droid?