diff --git a/gulpfile.js b/gulpfile.js
index 6174fbd6cc31f..df44b7b018556 100644
--- a/gulpfile.js
+++ b/gulpfile.js
@@ -208,9 +208,6 @@ function createWebpackConfig(
   }
   const babelExcludeRegExp = new RegExp(`(${babelExcludes.join("|")})`);
 
-  // Since logical assignment operators is a fairly new ECMAScript feature,
-  // for now we translate these regardless of the `SKIP_BABEL` value (with the
-  // exception of `MOZCENTRAL`/`TESTING`-builds where this isn't an issue).
   const babelPlugins = [
     "@babel/plugin-transform-modules-commonjs",
     [
@@ -221,9 +218,6 @@ function createWebpackConfig(
       },
     ],
   ];
-  if (!bundleDefines.MOZCENTRAL && !bundleDefines.TESTING) {
-    babelPlugins.push("@babel/plugin-proposal-logical-assignment-operators");
-  }
 
   const plugins = [];
   if (!disableLicenseHeader) {
@@ -1416,7 +1410,6 @@ function buildLibHelper(bundleDefines, inputStream, outputDir) {
       sourceType: "module",
       presets: skipBabel ? undefined : ["@babel/preset-env"],
       plugins: [
-        "@babel/plugin-proposal-logical-assignment-operators",
         "@babel/plugin-transform-modules-commonjs",
         [
           "@babel/plugin-transform-runtime",