To start recording scripts, first you will need to download the Transaction Monitoring Recorder and install it as an add-on to your Firefox browser.
To download the Recorder, go to Tools -> Extensions and select Transaction Recorder.
Open Firefox and go to Add-ons.
In the Extensions tab click on the gear icon and select Install Add-on from file.
In the Select add-on to install dialog navigate to the downloaded recorder file and select it to start the installation.
The Transaction Recorder will be added as an extension in your Firefox.