i use fiddler autoresponder to ensure that tools do not break out to other domains.
attached you can see how i configured it in the past.
today after month of upgrade questions and 100 "NO!" i updated and now exactly this features is buggy.
the regex tester shows that the regex is valid but the requests gets *reset.
for example this rules allows only amazon pages regex:(?inx)^(?!http.\:\/\/[a-zA-Z0-9\-\.]*amazon\.com).*$
check the attachment. with version v188.8.131.52002 its working
with v184.108.40.206034 not