<p>My Firefox 3.0.4 does not display non-existing images at all, or it displays the image alt as plain text (if available).<br/>
This way I would have no idea that there is supposed to be an image there.</p>

<p>Does anyone know if there is a way to make it work like IE/Opera? (ie. display a box even if the image file doesn't exists) - plugin or anything?</p>

<p>Test image: <img src="https://example.com/notavalidlink" alt="[broken image test]"></p>

As far as i know there is no plugin, Images should have a width and height specified like so:
```
```
<img src='...' width='100' height='100' alt='...'></img>
or
<img src='...' alt='...' style='width:100px; height:100px;'></img>
```
```
Then firefox will reserve the appropiate space for the images.