diff --git a/pkgs/applications/networking/browsers/firefox-bin/default.nix b/pkgs/applications/networking/browsers/firefox-bin/default.nix
index fc702993338..30a4cb6766c 100644
--- a/pkgs/applications/networking/browsers/firefox-bin/default.nix
+++ b/pkgs/applications/networking/browsers/firefox-bin/default.nix
@@ -198,11 +198,9 @@ stdenv.mkDerivation {
   meta = with lib; {
     description = "Mozilla Firefox, free web browser (binary package)";
     homepage = "http://www.mozilla.org/firefox/";
-    license = {
-      free = false;
-      url = "http://www.mozilla.org/en-US/foundation/trademarks/policy/";
-    };
+    license = licenses.mpl20;
     platforms = builtins.attrNames mozillaPlatforms;
+    hydraPlatforms = [];
     maintainers = with maintainers; [ taku0 lovesegfault ];
   };
 }
diff --git a/pkgs/servers/mautrix-telegram/default.nix b/pkgs/servers/mautrix-telegram/default.nix
index b2dd5f4a97c..ebf87d95b67 100644
--- a/pkgs/servers/mautrix-telegram/default.nix
+++ b/pkgs/servers/mautrix-telegram/default.nix
@@ -60,7 +60,7 @@ in with python.pkgs; buildPythonPackage rec {
     pillow
     lxml
     setuptools
-    prometheus-client
+    prometheus_client
   ] ++ lib.optionals withE2BE [
     asyncpg
     python-olm