PHP-Error Problem with Firefox & Output Compression

With the following lines in the .htaccess file of a project using PHP-Error, any error which would be handled by PHP-Error makes Firefox cry.

```
php_flag zlib.output_compression On
php_value zlib.output_compression_level 5
```

The error in Firefox is:

```
The page you are trying to view cannot be shown because it uses an invalid or unsupported form of compression.
```
