Firefox dev edition has been my go to lately, highly recommended if you do a lot of markup / css debugging. Being able to see outlines around elements as I hover / scan through the DOM easily doubles my speed.
[0]: https://developer.mozilla.org/en-US/docs/Tools/Page_Inspecto...
/* I think they also include URL info up here */
h1 {
/* background-color: blue; */
background-color: grey;
}
Let's see how the new JS debugger feels.
Flexbox Inspector: https://developer.mozilla.org/en-US/docs/Tools/Page_Inspecto...