2 files changed, 23 insertions, 0 deletions
diff --git a/toolkit/xre/test/win/mochitest/browser_env_path_long.ini b/toolkit/xre/test/win/mochitest/browser_env_path_long.ini
new file mode 100644
index 0000000000..9eb5a7b6e4
--- /dev/null
+++ b/toolkit/xre/test/win/mochitest/browser_env_path_long.ini
@@ -0,0 +1,7 @@
+[DEFAULT]
+# This path should expand to >32K characters. See bug 1753910.
+environment =
+  PATH="C:/loremipsumdolorsitamet/adipiscingconsectetuerelit/;C:/loremipsumdolorsitamet/adipiscingconsectetuerelit/;C:/loremipsumdolorsitamet/adipiscingconsectetuerelit/;C:/loremipsumdolorsitamet/adipiscingconsectetuerelit/;C:/loremipsumdolorsitamet/adipiscingconsectetuerelit/;C:/loremipsumdolorsitamet/adipiscingconsectetuerelit/;C:/loremipsumdolorsitamet/adipiscingconsectetuerelit/;C:/loremipsumdolorsitamet/adipiscingconsectetuerelit/;C:/loremipsumdolorsitamet/adipiscingconsectetuerelit/;C:/loremipsumdolorsitamet/adipiscingconsectetuerelit/;C:/loremipsumdolorsitamet/adipiscingconsectetuerelit/;C:/loremipsumdolorsitamet/adipiscingconsectetuerelit/;C:/loremipsumdolorsitamet/adipiscingconsectetuerelit/;C:/loremipsumdolorsitamet/adipiscingconsectetuerelit/;C:/loremipsumdolorsitamet/adipiscingconsectetuerelit/;C:/loremipsumdolorsitamet/adipiscingconsectetuerelit/;%PATH%;%PATH%;%PATH%;%PATH%;%PATH%;%PATH%;%PATH%;%PATH%;%PATH%;%PATH%;%PATH%;%PATH%;%PATH%;%PATH%;%PATH%;%PATH%;%PATH%;%PATH%;%PATH%;%PATH%;%PATH%;%PATH%;%PATH%;%PATH%;%PATH%;%PATH%;%PATH%;%PATH%;%PATH%;%PATH%"
+
+[browser_env_path_long.js]
+skip-if = os != "win"
diff --git a/toolkit/xre/test/win/mochitest/browser_env_path_long.js b/toolkit/xre/test/win/mochitest/browser_env_path_long.js
new file mode 100644
index 0000000000..9bc63214b0
--- /dev/null
+++ b/toolkit/xre/test/win/mochitest/browser_env_path_long.js
@@ -0,0 +1,16 @@
+// Any copyright is dedicated to the Public Domain.
+// http://creativecommons.org/publicdomain/zero/1.0/
+
+// Test that the browser starts even when PATH would expand to a detrimentally
+// long value.
+add_task(async function test() {
+  await BrowserTestUtils.withNewTab(
+    { gBrowser, url: "about:blank" },
+    function (browser) {
+      ok(
+        true,
+        "Browser should start even with potentially pathologically long PATH."
+      );
+    }
+  );
+});