First of all, thank you for making such an awesome project to what it has become.

I have no idea how to reproduce this, it appears that the issue appeared suddenly and is not showing any interest of going away.

This is what my menu looks like at this moment:

The pushing of those buttons does not produce any visible result.

Things I tried doing to fix this:

• Checking whether this is only in normal or also in incognito mode (issue is in both).
• Removing everything except browsing history from the beginning of time.
• Re-installing the extension.
• Closing Chromium completely and re-opening.

Version 37.0.2062.120 Built on Ubuntu 12.04, running on elementary OS 0.2.1 (281580) (64-bit)