diff --git a/tools/make-firefox-meta.py b/tools/make-firefox-meta.py
new file mode 100644
index 0000000..c1fce91
--- /dev/null
+++ b/tools/make-firefox-meta.py
@@ -0,0 +1,75 @@
+#!/usr/bin/env python3
+
+import os
+import json
+import sys
+from shutil import rmtree
+from collections import OrderedDict
+
+if not sys.argv[1]:
+	raise SystemExit('Build dir missing.')
+
+
+def mkdirs(path):
+    try:
+        os.makedirs(path)
+    finally:
+        return os.path.exists(path)
+
+pj = os.path.join
+
+build_dir = os.path.abspath(sys.argv[1])
+source_locale_dir = pj(build_dir, '_locales')
+target_locale_dir = pj(build_dir, 'locale')
+language_codes = []
+description = ''
+
+for alpha2 in os.listdir(source_locale_dir):
+    locale_path = pj(source_locale_dir, alpha2, 'messages.json')
+    with open(locale_path, encoding='utf-8') as f:
+        string_data = json.load(f, object_pairs_hook=OrderedDict)
+
+    if alpha2 == 'en':
+        description = string_data['extShortDesc']['message']
+
+    alpha2 = alpha2.replace('_', '-')
+
+    language_codes.append(alpha2)
+
+    mkdirs(pj(target_locale_dir, alpha2))
+
+    locale_path = pj(target_locale_dir, alpha2, 'messages.properties')
+    with open(locale_path, 'wt', encoding='utf-8', newline='\n') as f:
+        for string_name in string_data:
+            f.write(string_name)
+            f.write('=')
+            f.write(string_data[string_name]['message'].replace('\n', r'\n'))
+            f.write('\n')
+
+# generate chrome.manifest file
+chrome_manifest = pj(build_dir, 'chrome.manifest')
+
+with open(chrome_manifest, 'at', encoding='utf-8', newline='\n') as f:
+    f.write('\n')
+
+    for alpha2 in language_codes:
+        f.write('locale ublock ' + alpha2 + ' ./locale/' + alpha2 + '/\n')
+
+rmtree(source_locale_dir)
+
+# update install.rdf
+proj_dir = pj(os.path.split(os.path.abspath(__file__))[0], '..')
+chromium_manifest = pj(proj_dir, 'platform', 'chromium', 'manifest.json')
+
+with open(chromium_manifest, encoding='utf-8') as m:
+    manifest = json.load(m)
+
+manifest['description'] = description
+
+install_rdf = pj(build_dir, 'install.rdf')
+
+with open(install_rdf, 'r+t', encoding='utf-8', newline='\n') as f:
+    install_rdf = f.read()
+    f.seek(0)
+
+    f.write(install_rdf.format(**manifest))