diff --git a/pkgs/by-name/firefox-extensions/package.nix b/pkgs/by-name/firefox-extensions/package.nix
index 1cb4c88e9..3990d4588 100644
--- a/pkgs/by-name/firefox-extensions/package.nix
+++ b/pkgs/by-name/firefox-extensions/package.nix
@@ -129,8 +129,8 @@ let
         extid = "webextension@metamask.io";
         pname = "ether-metamask";
         url = "https://github.com/MetaMask/metamask-extension/releases/download/v${version}/metamask-firefox-${version}.zip";
-        version = "12.5.0";
-        hash = "sha256-3DO7JtMAn6HpeQtU/uq+wjnqhWvv/rJ0Lc4e+qkn54k=";
+        version = "12.6.0";
+        hash = "sha256-6A8xsXDjX2dOYUbcxezr0tJsUMwzDf64n2PaJ55HPcM=";
       };
       fx_cast = fetchVersionedAddon rec {
         extid = "fx_cast@matt.tf";