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diff --git a/dom/quota/test/xpcshell/test_persist_eviction.js b/dom/quota/test/xpcshell/test_persist_eviction.js
new file mode 100644
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+++ b/dom/quota/test/xpcshell/test_persist_eviction.js
@@ -0,0 +1,82 @@
+/**
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+/**
+ * This test is mainly to verify that normally the oldest origin will be
+ * evicted if the global limit is reached, but if the oldest origin is
+ * persisted or is an extension origin, then it won't be evicted.
+ */
+
+loadScript("dom/quota/test/xpcshell/common/utils.js");
+
+async function testSteps() {
+  // The group limit is calculated as 20% of the global limit and the minimum
+  // value of the group limit is 10 MB.
+
+  const groupLimitKB = 10 * 1024;
+  const globalLimitKB = groupLimitKB * 5;
+
+  setGlobalLimit(globalLimitKB);
+
+  let request = clear();
+  await requestFinished(request);
+
+  for (let persistOldestOrigin of [false, true]) {
+    info(
+      "Testing " +
+        (persistOldestOrigin ? "with" : "without") +
+        " persisting the oldest origin"
+    );
+
+    info(
+      "Step 0: Filling a moz-extension origin as the oldest origin with non-persisted data"
+    );
+
+    // Just a fake moz-extension origin to mock an extension origin.
+    let extUUID = "20445ca5-75f9-420e-a1d4-9cccccb5e891";
+    let spec = `moz-extension://${extUUID}`;
+    await fillOrigin(getPrincipal(spec), groupLimitKB * 1024);
+
+    info(
+      "Step 1: Filling five separate web origins to reach the global limit " +
+        "and trigger eviction"
+    );
+
+    for (let index = 1; index <= 5; index++) {
+      let spec = "http://example" + index + ".com";
+      if (index == 1 && persistOldestOrigin) {
+        request = persist(getPrincipal(spec));
+        await requestFinished(request);
+      }
+      await fillOrigin(getPrincipal(spec), groupLimitKB * 1024);
+    }
+
+    info("Step 2: Verifying origin directories");
+
+    for (let index = 1; index <= 5; index++) {
+      let path = "storage/default/http+++example" + index + ".com";
+      let file = getRelativeFile(path);
+      if (index == (persistOldestOrigin ? 2 : 1)) {
+        ok(!file.exists(), "The origin directory " + path + " doesn't exist");
+      } else {
+        ok(file.exists(), "The origin directory " + path + " does exist");
+      }
+    }
+
+    // Verify that the extension storage data has not been evicted (even if it wasn't marked as
+    // persisted and it was the less recently used origin).
+    let path = `storage/default/moz-extension+++${extUUID}`;
+    let file = getRelativeFile(path);
+    ok(file.exists(), "The origin directory " + path + "does exist");
+
+    request = clear();
+    await requestFinished(request);
+  }
+
+  resetGlobalLimit();
+
+  request = reset();
+  await requestFinished(request);
+}