Chrome extension HTML Tree Generator is not working

Question

I am learning DOM (Document Object Model) so I have installed HTML Tree Generator to view the hierarchy, but whenever I start the extension it loads only instead of showing the tree. If it has any bug so is there any other extension similar to this? I have attached the screenshot for more help.

Answer 1

I don't really get the benefit over simple browser inspecting, but one of the reviews say:

One needs to go to "Manage Settings" and then enable "Allow access to file URLs" before it will work. otherwise you will just see "Loading" when you try to use it.

Answer 2

Just right click on HTML Tree generator and select manage extension n then allow access to URLs...