diff --git a/packages/firefox.nix b/packages/firefox.nix
index d61c104..64b31a1 100644
--- a/packages/firefox.nix
+++ b/packages/firefox.nix
@@ -57,6 +57,7 @@ in pkgs.wrapFirefox pkgs.firefox-esr-unwrapped {
       Extensions = {
         Install = [
           "uBlock0@raymondhill.net"
+          "French-GC@grammalecte.net"
         ];             
       };
       ExtensionSettings = {
@@ -64,6 +65,10 @@ in pkgs.wrapFirefox pkgs.firefox-esr-unwrapped {
           installation_mode = "force_installed";
           install_url = "https://addons.mozilla.org/firefox/downloads/latest/ublock-origin/latest.xpi";
         };
+        "French-GC@grammalecte.net" = {
+          installation_mode = "force_installed";
+          install_url = "https://addons.mozilla.org/firefox/downloads/latest/grammalecte-fr/latest.xpi";
+        };
       };
       ExtensionUpdate = true;
     };