diff --git a/README.md b/README.md
index e350e15e1..f258594cd 100644
--- a/README.md
+++ b/README.md
@@ -227,6 +227,25 @@ jobs:
           browser: chrome
 ```
 
+Note that if you are using Firefox and a container, you need to pass a `--user 1001` to the options for the container, otherwise it will not work.
+Example:
+
+```yml
+name: E2E in custom container
+on: push
+jobs:
+  cypress-run:
+    runs-on: ubuntu-22.04
+    container: 
+     image: cypress/browsers:node18.12.0-chrome106-ff106
+     options: --user 1001  
+    steps:
+      - uses: actions/checkout@v3
+      - uses: cypress-io/github-action@v5
+        with:
+          browser: firefox
+```
+
 ### Env
 
 Specify the env argument with `env` parameter