How to get back the toolbar below personnal bar on top of window please ?

Cette extension est un must, définitivement !

like it,but now,have some problem.firefox 55.03 version not showing properly

The web developer is as important to my web design and site management as any of my Adobe software.

It's a shame Firefox screwed up big time with the new add-ons system. It made this awesome plugin useless for me.
I don't and never will use Firefox 57 so i've crawled the internet and installed the 1.2.13 XPI and then blocked updates.

So 5 stars for the old one and 0 stars for Firefox 57

I love that I can have a tool that I can just click and see the code etc from any website or webpage.