For using FirefoxPortable use the following steps:
[FirefoxPortable] FirefoxDirectory=App\firefox ProfileDirectory=Data\profile SettingsDirectory=Data\settings PluginsDirectory=Data\plugins FirefoxExecutable=ffp.EXE AdditionalParameters= LocalHomepage= WaitForFirefox=true DisableSplashScreen=true AllowMultipleInstances=true DisableIntelligentStart=false SkipChromeFix=false SkipCompregFix=false RunLocally=true
5. Open the pms_config.ini and change the following parameters to:
BrowserType=PORTABLEFIREFOX BrowserPath=FirefoxPortable/FirefoxPortable.EXE
6. You are done!