Bug 1965487 - Update Experimenter Stage URL

Author: AllegroFox

CHANGELOG.md

@@ -7,6 +7,9 @@
 - return Result in PrimaryPasswordAuthenticator callbacks (again a breaking change, but not yet used by anyone)
 - add factory for login store with nss key manager: `create_login_store_with_nss_keymanager` to avoid round-tripping the KeyManager trait interface through JS.
 
+### Nimbus
+- Updated the Nimbus API Stage URL
+
 # v141.0 (_2025-06-23_)
 
 ## ✨ What's New ✨

components/support/nimbus-cli/src/config.rs

@@ -305,8 +305,9 @@ pub(crate) fn api_v6_production_server() -> String {
 }
 
 pub(crate) fn api_v6_stage_server() -> String {
-    std::env::var("NIMBUS_API_URL_STAGE")
-        .unwrap_or_else(|_| "https://stage.experimenter.nonprod.dataops.mozgcp.net".to_string())
+    std::env::var("NIMBUS_API_URL_STAGE").unwrap_or_else(|_| {
+        "https://stage.experimenter.nonprod.webservices.mozgcp.net/api/v6".to_string()
+    })
 }
 
 pub(crate) fn manifest_cache_dir() -> Option<PathBuf> {