diff --git a/Makefile b/Makefile
index 0b6ef185..7e33cffa 100644
--- a/Makefile
+++ b/Makefile
@@ -63,6 +63,10 @@ regex = ^\(user_\)\?pref/s/^.*pref("\([^"]\+\)",\s*\([^)]\+\).*$$
 tbb-diff: 000-tor-browser.js
 	diff <(sed -n '/$(regex)/\1 = \2/p' user.js | sort) <(sed -n '/$(regex)/\1 = \2/p' $< | sort)
 
+.PHONY: tbb-diff-2
+tbb-diff-2: 000-tor-browser.js
+	for setting in $$( comm -12 <(sed -n '/$(regex)/\1/p' user.js | sort) <(sed -n '/$(regex)/\1/p' $< | sort)); do diff <(grep "$${setting}" user.js | sed -n '/$(regex)/\1 = \2/p' | sort) <(grep "$${setting}" $< | sed -n '/$(regex)/\1 = \2/p' | sort); done
+
 .PHONY: tbb-missing-from-user.js
 tbb-missing-from-user.js: 000-tor-browser.js
 	comm -13 <(sed -n '/$(regex)/\1/p' user.js | sort) <(sed -n '/$(regex)/\1/p' $< | sort)