diff --git a/assets/panel/prefs.js b/assets/panel/prefs.js
index d24fa5bf30..3a6e59aef2 100644
--- a/assets/panel/prefs.js
+++ b/assets/panel/prefs.js
@@ -40,6 +40,6 @@ pref("devtools.debugger.tabs", "[]");
 pref("devtools.debugger.pending-selected-location", "{}");
 pref("devtools.debugger.pending-breakpoints", "{}");
 pref("devtools.debugger.expressions", "[]");
-pref("devtools.debugger.file-search-case-sensitive", true);
+pref("devtools.debugger.file-search-case-sensitive", false);
 pref("devtools.debugger.file-search-whole-word", false );
 pref("devtools.debugger.file-search-regex-match", false);
diff --git a/src/utils/prefs.js b/src/utils/prefs.js
index da34fdc68c..7ecc5c551d 100644
--- a/src/utils/prefs.js
+++ b/src/utils/prefs.js
@@ -20,7 +20,7 @@ if (isDevelopment()) {
   pref("devtools.debugger.pending-selected-location", "{}");
   pref("devtools.debugger.pending-breakpoints", "{}");
   pref("devtools.debugger.expressions", "[]");
-  pref("devtools.debugger.file-search-case-sensitive", true);
+  pref("devtools.debugger.file-search-case-sensitive", false);
   pref("devtools.debugger.file-search-whole-word", false);
   pref("devtools.debugger.file-search-regex-match", false);
   pref("devtools.debugger.prefs-schema-version", "1.0.0");