Rated 1 out of 5 stars
When you accidentally click on a tab and doesn't respond fast enough that you would think you didn't click the tab and when you click it again it will close unintentionally and you would loose data.
Tab Clicking Options is a FAR BETTER Add-on.
Response to Q
Q, I have not understood, who „doesn't respond fast enough“?
Is it my CloseTabByDC or just whole Firefox?
If my one, I just made it faster today. (Although I personally never experienced troubles with its speed and responsibiliy.)