--- a/devtools/client/styleeditor/StyleSheetEditor.jsm
+++ b/devtools/client/styleeditor/StyleSheetEditor.jsm
@@ -110,27 +110,25 @@ function StyleSheetEditor(
   if (
     this.styleSheet.href &&
     Services.io.extractScheme(this.styleSheet.href) == "file"
   ) {
     this._styleSheetFilePath = this.styleSheet.href;
   }
 
   this.onPropertyChange = this.onPropertyChange.bind(this);
-  this._onError = this._onError.bind(this);
   this.onMediaRulesChanged = this.onMediaRulesChanged.bind(this);
   this.checkLinkedFileForChanges = this.checkLinkedFileForChanges.bind(this);
   this.markLinkedFileBroken = this.markLinkedFileBroken.bind(this);
   this.saveToFile = this.saveToFile.bind(this);
   this.updateStyleSheet = this.updateStyleSheet.bind(this);
   this._updateStyleSheet = this._updateStyleSheet.bind(this);
   this._onMouseMove = this._onMouseMove.bind(this);
 
   this._focusOnSourceEditorReady = false;
-  this.styleSheet.on("error", this._onError);
   this.savedFile = this.styleSheet.file;
   this.linkCSSFile();
 
   this.emitMediaRulesChanged = throttle(
     this.emitMediaRulesChanged,
     EMIT_MEDIA_RULES_THROTTLING,
     this
   );
@@ -438,25 +436,16 @@ StyleSheetEditor.prototype = {
   /**
    * Forward media-rules-changed event from stylesheet.
    */
   emitMediaRulesChanged: function() {
     this.emit("media-rules-changed", this.mediaRules);
   },
 
   /**
-   * Forward error event from stylesheet.
-   *
-   * @param  {Object} data: The parameters to customize the error message
-   */
-  _onError: function(data) {
-    this.emit("error", data);
-  },
-
-  /**
    * Create source editor and load state into it.
    * @param  {DOMElement} inputElement
    *         Element to load source editor in
    * @param  {CssProperties} cssProperties
    *         A css properties database.
    *
    * @return {Promise}
    *         Promise that will resolve when the style editor is loaded.
@@ -894,17 +883,16 @@ StyleSheetEditor.prototype = {
       ) {
         this._sourceEditor.container.contentWindow.removeEventListener(
           "mousemove",
           this._onMouseMove
         );
       }
       this._sourceEditor.destroy();
     }
-    this.styleSheet.off("error", this._onError);
     this._isDestroyed = true;
   },
 };
 
 /**
  * Find a path on disk for a file given it's hosted uri, the uri of the
  * original resource that generated it (e.g. Sass file), and the location of the
  * local file for that source.