diff --git a/tools/make-webext-meta.py b/tools/make-webext-meta.py
index 6fc340f4a..15f8946e5 100644
--- a/tools/make-webext-meta.py
+++ b/tools/make-webext-meta.py
@@ -20,16 +20,13 @@ webext_manifest_file = os.path.join(build_dir, 'manifest.json')
 with open(webext_manifest_file) as f2:
     webext_manifest = json.load(f2)
 
-match = re.search('^(\d+\.\d+\.\d+)(\.\d+)$', version)
+webext_manifest['version'] = version
+
+match = re.search('^\d+\.\d+\.\d+\.\d+$', version)
 if match:
-    buildtype = int(match.group(2)[1:])
-    if buildtype < 100:
-        builttype = 'b' + str(buildtype)
-    else:
-        builttype = 'rc' + str(buildtype - 100)
-    webext_manifest['version'] = match.group(1) + builttype
-else:
-    webext_manifest['version'] = version
+    webext_manifest['name'] += ' development build'
+    webext_manifest['short_name'] += ' dev build'
+    webext_manifest['browser_action']['default_title'] += ' dev build'
 
 with open(webext_manifest_file, 'w') as f2:
     json.dump(webext_manifest, f2, indent=2, separators=(',', ': '), sort_keys=True)