What is the difference between actively running extension and turned off extension ?
An actively running extension is one that is loaded on the chrome browser profile and is current set to communication with and interact with the chrome browser.
The way to tell if an extension is actively running is by:
1. Open browser bar and enter chrome://extensions/
2. Look at all the extensions listed. If an extension has the blue toggle switch enabled then it is enabled.
3. You can count the number of extensions enable and not this down.
Alternatively you can use a extension manager as described here to find this information.