diff --git a/include/pyjs/pre_js/init.js b/include/pyjs/pre_js/init.js
index 1651d1b..2ccb5cf 100644
--- a/include/pyjs/pre_js/init.js
+++ b/include/pyjs/pre_js/init.js
@@ -4,7 +4,7 @@ Module._is_initialized = false
 
 Module['init_phase_1'] = async function(prefix, python_version, verbose) {
 
-    if(verbose){console.log("in init phase 1");}    
+    if(verbose){console.log("in init phase 1");}
     let version_str = `${python_version[0]}.${python_version[1]}`;
 
     // list of python objects we need to delete when cleaning up
@@ -19,7 +19,7 @@ Module['init_phase_1'] = async function(prefix, python_version, verbose) {
     var p = await Module['_wait_run_dependencies']();
 
     if(prefix == "/"){
-        Module.setenv("LANG", "en_US.UTF-8");   
+        Module.setenv("LANG", "en_US.UTF-8");
 
         // LC_COLLATE="C"
         // LC_CTYPE="UTF-8"
@@ -48,7 +48,7 @@ Module['init_phase_1'] = async function(prefix, python_version, verbose) {
     }
 
 
-    
+
 
     // Module["_interpreter"] = new Module["_Interpreter"]()
     console.log("initialize interpreter");
@@ -164,7 +164,7 @@ Module['init_phase_1'] = async function(prefix, python_version, verbose) {
             return ret['ret']
         }
     };
-    if(verbose){console.log("in init phase 1 done!!");}    
+    if(verbose){console.log("in init phase 1 done!!");}
 }
 
 Module['init_phase_2'] =  function(prefix, python_version, verbose) {
@@ -216,7 +216,7 @@ def _add_resolve_done_callback(future, resolve, reject):
 
     ensured_future.add_done_callback(done)
     `)
-    
+
     Module._add_resolve_done_callback = Module.eval(`_add_resolve_done_callback`)
     Module._py_objects.push(Module._add_resolve_done_callback);
 
@@ -262,17 +262,43 @@ _mock_termios()
 del _mock_termios
 
 def _mock_webbrowser():
+    webbrowser_mock = types.ModuleType("webbrowser")
+
+    def get():
+        webbrowser_mock
+
     def open(url, new=0, autoraise=True):
-        pass
+        import pyjs
+        is_main_thread = pyjs.js.Function("""return typeof WorkerGlobalScope === "undefined" || !(self instanceof WorkerGlobalScope);""")()
+        if is_main_thread:
+            pyjs.js.window.open(url)
+        else:
+            # we're in a web worker
+            # This is sent to the main thread, which will do the window.open if implemented
+            obj = pyjs.js.Function("url","n",
+            """
+                    return {'OPEN_TAB':{'url': url, 'new': n}}
+            """
+            )(url, new)
+            pyjs.js.postMessage(obj)
+
     def open_new(url):
         return open(url, 1)
+
     def open_new_tab(url):
         return open(url, 2)
 
-    webbrowser_mock = types.ModuleType("webbrowser")
+    webbrowser_mock.name = pyjs.js.Function("""
+        return /firefox/i.test(navigator.userAgent) ? "firefox"
+          : /edg/i.test(navigator.userAgent) ? "edge"
+          : /chrome|crios/i.test(navigator.userAgent) ? "chrome"
+          : /safari/i.test(navigator.userAgent) ? "safari"
+          : "Unknown";""")()
+    webbrowser_mock.get = get
     webbrowser_mock.open = open
     webbrowser_mock.open_new = open_new
     webbrowser_mock.open_new_tab = open_new_tab
+    webbrowser_mock.Error = RuntimeError
 
     sys.modules["webbrowser"] = webbrowser_mock
 _mock_webbrowser()
diff --git a/tests/tests/test_pyjs.py b/tests/tests/test_pyjs.py
index 94497d2..745d6b3 100644
--- a/tests/tests/test_pyjs.py
+++ b/tests/tests/test_pyjs.py
@@ -23,10 +23,10 @@
 if sys.version_info[0] == 3 and sys.version_info[1] >= 13:
     def test_ssl_import():
         import ssl
-    
+
     def test_import_lzma():
         import lzma
-        
+
 def test_js_submodule():
     from pyjs.js import Function
 
@@ -247,8 +247,8 @@ def test_to_js_dict():
 
 
 def test_bytes_to_js():
-    pyjs.to_js(b"\x00").byteLength == 1   
-    
+    pyjs.to_js(b"\x00").byteLength == 1
+
 
 
 def test_to_js_none():
@@ -393,7 +393,7 @@ def implicit_to_js(self):
             obj = pyjs.js_object()
             obj["the_value"] = self.value
             return obj
-    
+
     class Bar(object):
         def __init__(self, value):
             self.value = value
@@ -403,7 +403,7 @@ def explicit_to_js(self):
             obj = pyjs.js_object()
             obj["the_value"] = self.value
             return obj
-    
+
     class FooBarInstance(object):
         def __init__(self, value):
             self.value = value
@@ -419,8 +419,8 @@ def implicit_to_js(self):
             obj = pyjs.js_object()
             obj["the_implicit_value"] = self.value
             return obj
-    
-    
+
+
 
     foo_instance = Foo(42)
     js_function = pyjs.js.Function("instance", """
@@ -439,7 +439,7 @@ def implicit_to_js(self):
     """)
     assert js_function(foo_bar_instance) is True
     assert js_function(pyjs.to_js(foo_bar_instance)) is False
-    
+
     js_function = pyjs.js.Function("instance", """
         return instance.the_explicit_value === 42;
     """)
@@ -464,13 +464,13 @@ def test_literal_map():
         if (converted.get("foo") !== 1 || converted.get("bar") !== "bar" || !converted.get("foobar").includes("foo") || !converted.get("foobar").includes("bar")) {
             throw new Error("converted does not have the correct keys");
         }
-        // ensure we can access the values via . 
+        // ensure we can access the values via .
         if (converted.foo !== 2 || converted.bar !== "bar" || !converted.foobar.includes("foo") || !converted.foobar.includes("bar")) {
             throw new Error("converted does not have the correct values when accessed via .");
         }
         return true;
     """)
-    
+
 
 def test_del_attr():
     obj = eval_jsfunc(
@@ -696,7 +696,3 @@ def test_imports_sys():
 
 def test_webbrowser():
     from webbrowser import open, open_new, open_new_tab
-
-    open("google.com")
-    open_new("google.com")
-    open_new_tab("google.com")