This is not an official Google product.

steamkeysactivator

Activates Steam Keys in bulks (Mac only)

It's a small and dumb script that reads the currently open Safari/Chrome page, searches for Steam keys and uses local Steam client to activate them one by one.

It's particularly useful for Humble Bundles.

How to run:

1) Check that you are using Mac OS and not Windows or Linux
2) Download everything to your Mac
3) Run this application
4) Check System Preferences, Security & Privacy, Privacy, Accessibility
5) In case app does not run try to run script itself in a Script Editor

Known to work with:

1) Humble Bundle 14
2) Steam in English April 2015th version
3) Mac OS Yosemite

Good luck! Feel free to send patches and bugs!