diff --git a/linux/firefox.md b/linux/firefox.md
index 28dcede..31b7c05 100644
--- a/linux/firefox.md
+++ b/linux/firefox.md
@@ -11,6 +11,12 @@ Links:
 2. Install flash plugin
 3. Create a separate user profile for this installation
 4. Symlink `libflashplugin.so` to `<user-profile-dir>/plugins/`
-5. Start Firefox with new profile like this: `</firefox-path>/firefox --profile <profile-path> --no-remote`
+5. Edit `/etc/adobe/mms.cfg` and add the following lines:
+   ```
+   AllowListUrlPattern=https://example.url
+   EOLUninstallDisable=1
+   ```
+   You may specify `AllowListUrlPattern` multiple times for multiple urls. `AllowListUrlPattern=*` or `AllowListUrlPattern=https://*` won't work
+6. Start Firefox with new profile like this: `</firefox-path>/firefox --profile <profile-path> --no-remote`
     * Use `--no-remote` to create a new window in a new session
     * Otherwise an already open Firefox would spawn a new window