diff --git a/devtools/client/debugger/src/components/Editor/Exception.js b/devtools/client/debugger/src/components/Editor/Exception.js
deleted file mode 100644
index b76923e597b6..000000000000
--- a/devtools/client/debugger/src/components/Editor/Exception.js
+++ /dev/null
@@ -1,102 +0,0 @@
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at <http://mozilla.org/MPL/2.0/>. */
-
-import { PureComponent } from "devtools/client/shared/vendor/react";
-import PropTypes from "devtools/client/shared/vendor/react-prop-types";
-
-import {
-  toEditorPosition,
-  getTokenEnd,
-  hasDocument,
-} from "../../utils/editor/index";
-
-import { getIndentation } from "../../utils/indentation";
-import { createLocation } from "../../utils/location";
-
-export default class Exception extends PureComponent {
-  exceptionLine;
-  markText;
-
-  static get propTypes() {
-    return {
-      exception: PropTypes.object.isRequired,
-      doc: PropTypes.object.isRequired,
-      selectedSource: PropTypes.string.isRequired,
-    };
-  }
-
-  componentDidMount() {
-    this.addEditorExceptionLine();
-  }
-
-  componentDidUpdate() {
-    this.clearEditorExceptionLine();
-    this.addEditorExceptionLine();
-  }
-
-  componentWillUnmount() {
-    this.clearEditorExceptionLine();
-  }
-
-  setEditorExceptionLine(doc, line, column, lineText) {
-    doc.addLineClass(line, "wrap", "line-exception");
-
-    column = Math.max(column, getIndentation(lineText));
-    const columnEnd = doc.cm ? getTokenEnd(doc.cm, line, column) : null;
-
-    const markText = doc.markText(
-      { ch: column, line },
-      { ch: columnEnd, line },
-      { className: "mark-text-exception" }
-    );
-
-    this.exceptionLine = line;
-    this.markText = markText;
-  }
-
-  addEditorExceptionLine() {
-    const { exception, doc, selectedSource } = this.props;
-    const { columnNumber, lineNumber } = exception;
-
-    if (!hasDocument(selectedSource.id)) {
-      return;
-    }
-
-    const location = createLocation({
-      source: selectedSource,
-      line: lineNumber,
-      // Exceptions are reported with column being 1-based
-      // while the frontend uses 0-based column.
-      column: columnNumber - 1,
-    });
-
-    const { line, column } = toEditorPosition(location);
-    const lineText = doc.getLine(line);
-
-    this.setEditorExceptionLine(doc, line, column, lineText);
-  }
-
-  clearEditorExceptionLine() {
-    if (this.markText) {
-      const { selectedSource } = this.props;
-
-      this.markText.clear();
-
-      if (hasDocument(selectedSource.id)) {
-        this.props.doc.removeLineClass(
-          this.exceptionLine,
-          "wrap",
-          "line-exception"
-        );
-      }
-      this.exceptionLine = null;
-      this.markText = null;
-    }
-  }
-
-  // This component is only used as a "proxy" to manipulate the editor.
-  render() {
-    return null;
-  }
-}
diff --git a/devtools/client/debugger/src/components/Editor/Exceptions.js b/devtools/client/debugger/src/components/Editor/Exceptions.js
index 2e09ccad75e1..ef06eca19f50 100644
--- a/devtools/client/debugger/src/components/Editor/Exceptions.js
+++ b/devtools/client/debugger/src/components/Editor/Exceptions.js
@@ -2,15 +2,11 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at <http://mozilla.org/MPL/2.0/>. */
 
-import React, { Component } from "devtools/client/shared/vendor/react";
+import { Component } from "devtools/client/shared/vendor/react";
 import PropTypes from "devtools/client/shared/vendor/react-prop-types";
 import { connect } from "devtools/client/shared/vendor/react-redux";
 
-import { getDocument } from "../../utils/editor/index";
 import { markerTypes } from "../../constants";
-import { features } from "../../utils/prefs";
-
-import Exception from "./Exception";
 
 import {
   getSelectedSource,
@@ -41,7 +37,7 @@ class Exceptions extends Component {
 
   clearMarkers(prevProps) {
     const { exceptions, selectedSource, editor } = this.props;
-    if (!features.codemirrorNext || !editor) {
+    if (!editor) {
       return;
     }
 
@@ -57,12 +53,7 @@ class Exceptions extends Component {
 
   setMarkers() {
     const { exceptions, selectedSource, editor } = this.props;
-    if (
-      !features.codemirrorNext ||
-      !selectedSource ||
-      !editor ||
-      !exceptions.length
-    ) {
+    if (!selectedSource || !editor || !exceptions.length) {
       return;
     }
 
@@ -85,29 +76,7 @@ class Exceptions extends Component {
   }
 
   render() {
-    const { exceptions, selectedSource } = this.props;
-
-    if (features.codemirrorNext) {
-      return null;
-    }
-
-    if (!selectedSource || !exceptions.length) {
-      return null;
-    }
-
-    const doc = getDocument(selectedSource.id);
-    return React.createElement(
-      React.Fragment,
-      null,
-      exceptions.map(exception =>
-        React.createElement(Exception, {
-          exception,
-          doc,
-          key: `${exception.sourceActorId}:${exception.lineNumber}`,
-          selectedSource,
-        })
-      )
-    );
+    return null;
   }
 }
 
diff --git a/devtools/client/debugger/src/components/Editor/moz.build b/devtools/client/debugger/src/components/Editor/moz.build
index 909e57d4eb26..dd712ec35739 100644
--- a/devtools/client/debugger/src/components/Editor/moz.build
+++ b/devtools/client/debugger/src/components/Editor/moz.build
@@ -16,7 +16,6 @@ CompiledModules(
     "ConditionalPanel.js",
     "DebugLine.js",
     "EmptyLines.js",
-    "Exception.js",
     "Exceptions.js",
     "Footer.js",
     "HighlightLine.js",