I do not expect from an extension like this to work perfectly on all web sites, and I would be happy to give it five stars IF there was not a major flaw: it interferes with some web sites and even with some other extensions.
For example it interferes with Google Maps, making it impossible to move the map with the mouse. The extension must be disabled then. And this is not the only web site with similar problems.
Also it interferes with an extension I use all the time: "Swift Selection Search", and perhaps others.
Basically, I have to keep it disabled, and enable it only if the need for it arises.

If the author cannot find a way to correct this problem, could he at least add a quick disactivate/activate option from the extension's icon.