Security Report shows 0 scanned when FireFox in Sandbox

When I view my security report in Chrome (also running in an Avast! sandbox) I get:

[b]Your avast! scanned 822,379 items in last 30 days[/b]

Here’s what it looks like in Firefox [my default browser] running in an Avast! sandbox:

`
[b]
Your avast! scanned 0 items in last 30 days

This report shows how your avast! security software performed in different areas – protecting your documents, emails, and web surfing.
File & Documents Protection

0files have been scanned

0files were found infected and healed
Web & Network Protection

0web & network objects have been scanned

0web & network objects were found infected and blocked
Email Protection

0emails have been scanned

0emails were found infected and healed
On-demand Security Scans

0files have been scanned

0files were found infected

0scans have been executed

0GB have been scanned
Top infected website in your country is NaN

Use the map below to check other countries and their top infected websites.
[/b]
`