Works ok, however I shouldn't have needed to go on an exploratory web search just to figure out how to add the icon to the toolbar - not the sort of thing I do every five minutes. It would have taken the Dev an extra 60 seconds to include this information. FWIW for anyone seing this in the future, to save you the hassle of looking it up, L-click the little jigsaw piece on the toolbar, L-click the correct addon, L-click the cog and select add to toolbar.

It's a great addon.

It's amazing. Easy to use.

Finally an extension able to execute what a web developer need to work.

good

useful.

Would be handy if it worked on a per url or active tab basis.