wip [ci skip]

diff --git a/.circleci/config.yml b/.circleci/config.yml
index a1d56b9..bf686ea 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml

@@ -167,7 +167,7 @@
           # --no-sandbox becasue we are running as root and chrome requires
           # this flag for now: https://crbug.com/638180
           CHROME_FLAGS_BASE="--no-first-run -start-maximized --no-sandbox --use-gl=swiftshader"
-          CHROME_FLAGS_WASM="--enable-features=WebAssembly --enable-features=SharedArrayBuffer --disable-features=WebAssemblyTrapHandler --js-flags=\"--experimental-wasm-threads --harmony-sharedarraybuffer --no-wasm-disable-structured-cloning\""
+          CHROME_FLAGS_WASM="--enable-features=WebAssembly --enable-features=SharedArrayBuffer --disable-features=WebAssemblyTrapHandler --enable-experimental-web-platform-features --js-flags=\"--experimental-wasm-threads --harmony-sharedarraybuffer --no-wasm-disable-structured-cloning\""
           export EMTEST_BROWSER="xvfb-run -a -e /dev/stdout /usr/bin/google-chrome-stable $CHROME_FLAGS_BASE $CHROME_FLAGS_WASM"
           export EMTEST_LACKS_GRAPHICS_HARDWARE=1
           export EMCC_CORES=4

diff --git a/src/preamble.js b/src/preamble.js
index 0c7cd5f..bb58c7f 100644
--- a/src/preamble.js
+++ b/src/preamble.js

@@ -1,4 +1,3 @@
-if (typeof log === 'function') log('premalbe');
 // === Preamble library stuff ===
 
 // Documentation for the public APIs defined in this file must be updated in:

diff --git a/tests/test_browser.py b/tests/test_browser.py
index b3f1e59..53baa7a 100644
--- a/tests/test_browser.py
+++ b/tests/test_browser.py

@@ -4716,28 +4716,14 @@
         print(str(args + wasm + modularize))
         self.btest('minimal_hello.c', '0', args=args + wasm + modularize)
 
+  @no_firefox('need to enable es6 modules there somehow')
   def _test_es6(self, args):
     args = args + ['-s', 'EXPORT_ES6', '-s', 'MODULARIZE', '-s', 'MODULARIZE_INSTANCE', '-s', 'ASSERTIONS', '-o', 'test.mjs']
     print(args)
     create_test_file('src.c', self.with_report_result(open(path_from_root('tests', 'browser_test_hello_world.c')).read()))
     self.compile_btest(['src.c'] + args)
     create_test_file('test.html', '''
-      <script>
-        var logs = 0;
-        function log(e) {
-          var xhr = new XMLHttpRequest();
-          xhr.open('GET', encodeURI('http://localhost:8888?stdout=' + e + ' : ' + new Error().stack + ' : ' + logs++));
-          xhr.send();
-        }
-        log('startup');
-        window.onerror = function(e) {
-          log(e);
-        };
-      </script>
       <script type="module" src="test.mjs"></script>
-      <script>
-        log('after');
-      </script>
     ''')
     self.run_browser('test.html', None, '/report_result?0')
 
@@ -4754,6 +4740,4 @@
   def test_es6_threads(self):
     # TODO: use PROXY_TO_PTHREAD and/or '-s', 'PTHREAD_POOL_SIZE=1' once https://bugs.chromium.org/p/chromium/issues/detail?id=680046 is fixed
     #       firefox also errors, "SyntaxError: dynamic module import is not implemented"
-    self._test_es6(['-s', 'USE_PTHREADS'])
-
-
+    self._test_es6(['-s', 'USE_PTHREADS', '-s', 'PROXY_TO_PTHREAD'])