diff --git a/browser/app/profile/firefox.js b/browser/app/profile/firefox.js
index 00e2abc25a9f..810410b3893a 100644
--- a/browser/app/profile/firefox.js
+++ b/browser/app/profile/firefox.js
@@ -3166,11 +3166,6 @@ pref("devtools.debugger.show-content-scripts", false);
 
 pref("devtools.debugger.hide-ignored-sources", false);
 
-// When `true` the debugger editor uses Codemirror v6
-// and when `false` the debugger editor uses Codemirror v5
-// This should be removed once the CM5 code is cleaned up. See Bug 1943909
-pref("devtools.debugger.features.codemirror-next", true);
-
 // Disable autohide for DevTools popups and tooltips.
 // This is currently not exposed by any UI to avoid making
 // about:devtools-toolbox tabs unusable by mistake.
diff --git a/devtools/client/debugger/src/utils/prefs.js b/devtools/client/debugger/src/utils/prefs.js
index 0fda85b2afd3..68ae30e9bd1e 100644
--- a/devtools/client/debugger/src/utils/prefs.js
+++ b/devtools/client/debugger/src/utils/prefs.js
@@ -60,7 +60,6 @@ if (isNode()) {
   pref("devtools.debugger.features.log-points", true);
   pref("devtools.debugger.features.inline-preview", true);
   pref("devtools.debugger.features.javascript-tracing", false);
-  pref("devtools.debugger.features.codemirror-next", true);
   pref("devtools.editor.tabsize", 2);
   pref("devtools.editor.expandtab", false);
   pref("devtools.editor.autoclosebrackets", false);
@@ -143,7 +142,6 @@ export const features = new PrefsHelper("devtools.debugger.features", {
   inlinePreview: ["Bool", "inline-preview"],
   windowlessServiceWorkers: ["Bool", "windowless-service-workers"],
   javascriptTracing: ["Bool", "javascript-tracing"],
-  codemirrorNext: ["Bool", "codemirror-next"],
 });
 
 // Import the asyncStore already spawned by the TargetMixin class