diff --git a/cms/djangoapps/contentstore/views.py b/cms/djangoapps/contentstore/views.py
index aa6f6ce235..1445c47c23 100644
--- a/cms/djangoapps/contentstore/views.py
+++ b/cms/djangoapps/contentstore/views.py
@@ -98,7 +98,7 @@ def edit_item(request):
     item = modulestore().get_item(item_location)
     return render_to_response('unit.html', {
         'contents': item.get_html(),
-        'js_module': item.__class__.__name__,
+        'js_module': item.js_module_name,
         'category': item.category,
         'name': item.name,
         'previews': get_module_previews(item),
diff --git a/cms/envs/common.py b/cms/envs/common.py
index c11ca297b6..41b34bdaa1 100644
--- a/cms/envs/common.py
+++ b/cms/envs/common.py
@@ -26,6 +26,7 @@ import os
 import errno
 import glob2
 import lms.envs.common
+import hashlib
 from path import path
 
 ############################ FEATURE CONFIGURATION #############################
@@ -190,18 +191,27 @@ except OSError as exc:
     else:
         raise
 
-module_js_sources = []
-for xmodule in XModuleDescriptor.load_classes() + [RawDescriptor]:
-    js = xmodule.get_javascript()
+fragments = set()
+for descriptor in XModuleDescriptor.load_classes() + [RawDescriptor]:
+    descriptor_js = descriptor.get_javascript()
+    module = getattr(descriptor, 'module_class', None)
+    if module is not None:
+        module_js = module.get_javascript()
+    else:
+        module_js = {}
+
     for filetype in ('coffee', 'js'):
-        for idx, fragment in enumerate(js.get(filetype, [])):
-            path = os.path.join(js_file_dir, "{name}.{idx}.{type}".format(
-                name=xmodule.__name__,
-                idx=idx,
-                type=filetype))
-            with open(path, 'w') as js_file:
-                js_file.write(fragment)
-            module_js_sources.append(path.replace(PROJECT_ROOT / "static/", ""))
+        for fragment in descriptor_js.get(filetype, []) + module_js.get(filetype, []):
+            fragments.add((filetype, fragment))
+
+module_js_sources = []
+for filetype, fragment in fragments:
+    path = os.path.join(js_file_dir, "{hash}.{type}".format(
+        hash=hashlib.md5(fragment).hexdigest(),
+        type=filetype))
+    with open(path, 'w') as js_file:
+        js_file.write(fragment)
+    module_js_sources.append(path.replace(PROJECT_ROOT / "static/", ""))
 
 PIPELINE_JS = {
     'main': {
diff --git a/cms/templates/widgets/navigation.html b/cms/templates/widgets/navigation.html
index d01e8197b8..5c8b783716 100644
--- a/cms/templates/widgets/navigation.html
+++ b/cms/templates/widgets/navigation.html
@@ -55,7 +55,7 @@
 
       <ul class="modules">
         % for module in week.get_children():
-        <li class="module" data-id="${module.location.url()}" data-type="${module.js_module_name()}">
+        <li class="module" data-id="${module.location.url()}" data-type="${module.js_module_name}">
             <a href="#" class="module-edit">${module.name}</a>
             <a href="#" class="draggable">handle</a>
         </li>
diff --git a/cms/templates/widgets/sequence-edit.html b/cms/templates/widgets/sequence-edit.html
index 017057c45d..5da8d8dfb2 100644
--- a/cms/templates/widgets/sequence-edit.html
+++ b/cms/templates/widgets/sequence-edit.html
@@ -36,7 +36,7 @@
           <ol>
             % for child in module.get_children():
             <li class="${module.category}">
-              <a href="#" class="module-edit" data-id="${child.location.url()}" data-type="${child.js_module_name()}">${child.name}</a>
+              <a href="#" class="module-edit" data-id="${child.location.url()}" data-type="${child.js_module_name}">${child.name}</a>
               <a href="#" class="draggable">handle</a>
             </li>
             %endfor
diff --git a/common/lib/xmodule/xmodule/x_module.py b/common/lib/xmodule/xmodule/x_module.py
index 12872f64f1..1dc92c915b 100644
--- a/common/lib/xmodule/xmodule/x_module.py
+++ b/common/lib/xmodule/xmodule/x_module.py
@@ -196,6 +196,11 @@ class XModule(object):
         return ""
 
     # ================================== HTML INTERFACE DEFINITIONS ======================
+
+    @property
+    def js_module_name(self):
+        return self.__class__.__name__
+
     @classmethod
     def get_javascript(cls):
         """
@@ -401,6 +406,10 @@ class XModuleDescriptor(Plugin):
         raise NotImplementedError('Modules must implement export_to_xml to enable xml export')
 
     # ================================== HTML INTERFACE DEFINITIONS ======================
+    @property
+    def js_module_name(self):
+        return self.__class__.__name__
+
     @classmethod
     def get_javascript(cls):
         """
diff --git a/lms/envs/common.py b/lms/envs/common.py
index 37ec0de15b..8b179e90d4 100644
--- a/lms/envs/common.py
+++ b/lms/envs/common.py
@@ -23,6 +23,7 @@ import os
 import tempfile
 import glob2
 import errno
+import hashlib
 
 import djcelery
 from path import path
@@ -341,7 +342,7 @@ except OSError as exc:
     else:
         raise
 
-module_js_sources = []
+fragments = set()
 for descriptor in XModuleDescriptor.load_classes() + [HiddenDescriptor]:
     module = getattr(descriptor, 'module_class', None)
     if module is None:
@@ -349,14 +350,17 @@ for descriptor in XModuleDescriptor.load_classes() + [HiddenDescriptor]:
 
     js = module.get_javascript()
     for filetype in ('coffee', 'js'):
-        for idx, fragment in enumerate(js.get(filetype, [])):
-            path = os.path.join(js_file_dir, "{name}.{idx}.{type}".format(
-                name=module.__name__,
-                idx=idx,
-                type=filetype))
-            with open(path, 'w') as js_file:
-                js_file.write(fragment)
-            module_js_sources.append(path.replace(PROJECT_ROOT / "static/", ""))
+        for fragment in js.get(filetype, []):
+            fragments.add((filetype, fragment))
+
+module_js_sources = []
+for filetype, fragment in fragments:
+    path = os.path.join(js_file_dir, "{hash}.{type}".format(
+        hash=hashlib.md5(fragment).hexdigest(),
+        type=filetype))
+    with open(path, 'w') as js_file:
+        js_file.write(fragment)
+    module_js_sources.append(path.replace(PROJECT_ROOT / "static/", ""))
 
 
 PIPELINE_JS = {