Does not work " View image information"!!! Progress stops at 50% on most pages.

Extension très utile pour développeur, intégrateur et web designer.

Useful tests for getting important loading values on own sites

There is no toolbar, I see nothing and there is nothing in View > Toolbars for it. The extension shows as enabled in Tools > Addons. I'm using Firefox 64.0.2, does this work for the new web extensions?