how do i get intego vpn to work with firefox

i have had intego vpn for some time, historically i was able to use firefox and intego vpn to access web sites only after i had executed a shut-down and restart, not good but it worked if i needed, but there is now an inability for Firefox to establish a valid connection to any website when intego vpn is active, both firefox and mac-os are up to date what do i have to do to get firefox and intego vpn to work together? sadly intego vpn performed well with chrome but chrome brings it's own problems:)