The Firefox V4R29 isn't the easiest of STIGs to apply.
This script will bring you up to 100% compliance minus 2 checks.
You must manually check Vul ID: V-15770 and V-15773
We now offer a playbook collection for this script. Please see the following:
Download the required files from the GitHub Repository
The script may be lauched from the extracted GitHub download like this:
Windows:
.\sos-firefoxstig.ps1
Linux:
sudo chmod +x ./sos-firefoxstig.sh
sudo bash ./sos-firefoxstig.sh