run script blocking causing much trouble

if i run a blocking script within btt and UNLUCKILY it wont find the application declared in the script (for exaple lets say i switched from firefox to firefox nighlty)
i got the apple windows to locate the app but the problem is that there s absolutely no way i can left ,right click or whatever ,or entering terminal command to kill btt the only alternative is to force a restart which really makes me furios
to better udestand the issue lets say u launch this stupid simple apple script AS BLOCKING from btt
tell application "Firefox"
end tell
but u no longer have firefox installed for whaever reason ,btt will block everything left or right click is NOT possible the only solution is to force a shutdown.
i m sure there s an easy way to force stop btt but since i cannot click i do not know how to achieve this