Firefox network prediction must be disabled.
Severity | Group ID | Group Title | Version | Rule ID | Date | STIG Version |
|---|---|---|---|---|---|---|
| medium | V-251566 | SRG-APP-000141 | FFOX-00-000022 | SV-251566r960963_rule | 2026-05-08 | 6 |
Description
If network prediction is enabled, requests to URLs are made without user consent. The browser should always make a direct DNS request without prefetching occurring.
ℹ️ Check
Type "about:policies" in the browser window.
If "NetworkPrediction" is not displayed under Policy Name or the Policy Value is not "false", this is a finding.
✔️ Fix
Windows group policy:
1. Open the group policy editor tool with "gpedit.msc".
2. Navigate to Policy Path: Computer Configuration\Administrative Templates\Mozilla\Firefox
Policy Name: Network Prediction
Policy State: Disabled
macOS "plist" file:
Add the following:
<key>NetworkPrediction</key>
<false/>
Linux "policies.json" file:
Add the following in the policies section:
"NetworkPrediction": false