Aware this isn't a target platform, but in case it's useful.
The extension works just fine, including the ability to set the keyboard shortcut. Passwords can also be filled by mousing over to the extension icon and activating that way. The only problem is that the keyboard shortcut doesn't open the extension menu.
I've checked this on OS X and Ubuntu 16.04, and it's the same behavior.
1Password Version: Not Provided
Extension Version: 0.8.6
OS Version: 10.11.6, Ubuntu 16.04
Sync Type: 1password.com