I just spent an hour trying to figure out why a CSS script wasn't loading. It turns out it was because I typed:

```
<link rel="styelsheet" href="path/to/script">

```

instead of 

```
<link rel="stylesheet" href="path/to/script">

```

It would have been nice had Firefox said something to me, like `styelsheet is unknown`, or whatever. I would have realized the typo immediately. Any way to get that in the console?