In it's previous version this addon is 4 stars, but now there is a new version.
Problems with the new version:
1) Harder to get to important numbers (like number of visits). For all users I know it's the most important number. Now you need to scroll down to get it, slows research a lot.
2) Eats a lot of CPU and memory, much more than the previous version. Now I need to switch off addon frequently to free resources. [I'm using Mac and up-to-date browser]
Update: checked addon on Windows, the same problem with memory usage. When you switch off addon, in-use RAM falls immediately and abruptly. The more tabs you have open, the more severe the problem is.