--- a/devtools/client/preferences/devtools-client.js
+++ b/devtools/client/preferences/devtools-client.js
@@ -288,16 +288,19 @@ pref("devtools.webconsole.autoMultiline"
 
 // Enable the webconsole sidebar toggle in Nightly builds.
 #if defined(NIGHTLY_BUILD)
 pref("devtools.webconsole.sidebarToggle", true);
 #else
 pref("devtools.webconsole.sidebarToggle", false);
 #endif
 
+// Enable CodeMirror in the JsTerm: |false|
+pref("devtools.webconsole.jsterm.codeMirror", false);
+
 // Disable the new performance recording panel by default
 pref("devtools.performance.new-panel-enabled", false);
 
 // Enable client-side mapping service for source maps
 pref("devtools.source-map.client-service.enabled", true);
 
 // The number of lines that are displayed in the web console.
 pref("devtools.hud.loglimit", 10000);