firefox: remove buggy config

user/firefox.nix

@@ -114,8 +114,6 @@ in
             "media.ffmpeg.vaapi.enabled" = true;
             "media.ffvpx.enabled" = true;
 
-            "gfx.webrender.all" = true;
-
             # Enable installing non signed extensions
             "extensions.langpacks.signatures.required" = false;
             "xpinstall.signatures.required" = false;
@@ -145,9 +143,5 @@ in
         exec firefox
       '';
     };
-    home.sessionVariables = {
-      MOZ_ENABLE_WAYLAND = "1";
-      MOZ_DISABLE_RDD_SANDBOX = "1";
-    };
   };
 }