--- a/browser/components/sessionstore/test/browser/Makefile.in
+++ b/browser/components/sessionstore/test/browser/Makefile.in
@@ -42,31 +42,31 @@ srcdir		= @srcdir@
 VPATH		= @srcdir@
 relativesrcdir  = browser/components/sessionstore/test/browser 
 
 include $(DEPTH)/config/autoconf.mk
 include $(topsrcdir)/config/rules.mk
 
 # browser_477657.js is disabled, because it's unreliable (bug 482975).
 # browser_480148.js is disabled, because it breaks browser_420786.js (see bug 483382).
+# browser_394759.js is disabled on suspicion of breaking various other tests
+# browser_394759_privatebrowsing.js likewise
 
 _BROWSER_TEST_FILES = \
 	browser_248970_a.js \
 	browser_248970_b.js \
 	browser_248970_b_sample.html \
 	browser_339445.js \
 	browser_339445_sample.html \
 	browser_345898.js \
 	browser_346337.js \
 	browser_346337_sample.html \
 	browser_350525.js \
 	browser_367052.js \
 	browser_393716.js \
-	browser_394759.js \
-	browser_394759_privatebrowsing.js \
 	browser_408470.js \
 	browser_408470_sample.html \
 	browser_447951.js \
 	browser_447951_sample.html \
 	browser_448741.js \
 	browser_454908.js \
 	browser_454908_sample.html \
 	browser_456342.js \