Удобно, минималистично.
Не хватает только прилипаниям к краям того или иного элемента при выделении. Или выделения при наведения, как у Файрбага.

good, thanks!

Great and simple Tool for Web Developers. I need it often to perfectly size Frontend Elements of my web pages. Thanks for this.

useful and work good

OK!

I used this handy extension quite a bit years ago and reinstalled today. I still love it.

Tut was es soll.

Doesn't work. Installed, granted permissions, clicking the icon in the toolbar does nothing.

EDIT: read other reviews, realised I was doing the same thing, tried it in another tab, works as expected.

All good, but I recommend you increase z-index. Some blocks (for example with z-index: 9999) located higher your add-on

Its good but need improvements.

I installed it, click on the button on bar but nothing happened...

edit: ehm.. I'm so embarrassed, sorry! Now it work!

It does what is says - measure pixels hassle free :)