diff --git a/apps/extension/FIREFOX_README.md b/apps/extension/FIREFOX_README.md
index 68403b9237..9482230b4f 100644
--- a/apps/extension/FIREFOX_README.md
+++ b/apps/extension/FIREFOX_README.md
@@ -52,12 +52,6 @@ cd apps/extension
 yarn wasm:build
 ```
 
-Before building the extension, you must specify the following value in a `.env` file in `apps/extension`:
-
-```bash
-NAMADA_INTERFACE_NAMADA_CHAIN_ID=internal-devnet-43.d9368f80c60
-```
-
 Then, issue the final build command for the Firefox add-on:
 
 ```bash