I'm not sure what level of nitpicky-ness you guys are looking for in this beta. This may be more fine-grained than you are focused on right now. But... if I do a CTRL-. to open the extension window, then a few characters to search for something, then to exit out of the search, hitting a second time will not exit the extension window. Ubuntu 14.04.5, 1password extension 0.8.4, Chromium 60.0.3112.78.
1Password Version: Not Provided
Extension Version: 0.8.4
OS Version: Ubuntu 14.04.5
Sync Type: Not Provided