diff --git a/e2e/maputnik-driver.ts b/e2e/maputnik-driver.ts
index f54177bb..08463a4e 100644
--- a/e2e/maputnik-driver.ts
+++ b/e2e/maputnik-driver.ts
@@ -493,6 +493,31 @@ export class MaputnikDriver {
     waitForExampleFileResponse: () => this.when.waitForResponse("example-style.json"),
 
     clearLocalStorage: () => this.page.evaluate(() => window.localStorage.clear()),
+
+    /** fill localStorage until we get a QuotaExceededError */
+    fillLocalStorage: async () => {
+      await this.page.evaluate(() => {
+        let chunkSize = 1000;
+        const chunk = new Array(chunkSize).join("x");
+        let index = 0;
+
+        // Keep adding until we hit the quota
+        for (;;) {
+          try {
+            const key = `maputnik:fill-${index++}`;
+            window.localStorage.setItem(key, chunk);
+          } catch (e: any) {
+            // Verify it's a quota error
+            if (e.name === "QuotaExceededError") {
+              if (chunkSize <= 1) return;
+              chunkSize /= 2;
+              continue;
+            }
+            throw e; // Unexpected error
+          }
+        }
+      });
+    }
   };
 
   // ---- get -----------------------------------------------------------------
diff --git a/e2e/modals.spec.ts b/e2e/modals.spec.ts
index 8ee3ba4a..655b1982 100644
--- a/e2e/modals.spec.ts
+++ b/e2e/modals.spec.ts
@@ -391,29 +391,7 @@ describe("modals", () => {
     test("handles quota exceeded error when opening style from URL", async ({ page }) => {
       // Clear localStorage to start fresh
       await when.clearLocalStorage();
-
-      // fill localStorage until we get a QuotaExceededError
-      await page.evaluate(() => {
-        let chunkSize = 1000;
-        const chunk = new Array(chunkSize).join("x");
-        let index = 0;
-
-        // Keep adding until we hit the quota
-        for (;;) {
-          try {
-            const key = `maputnik:fill-${index++}`;
-            window.localStorage.setItem(key, chunk);
-          } catch (e: any) {
-            // Verify it's a quota error
-            if (e.name === "QuotaExceededError") {
-              if (chunkSize <= 1) return;
-              chunkSize /= 2;
-              continue;
-            }
-            throw e; // Unexpected error
-          }
-        }
-      });
+      await when.fillLocalStorage();
 
       // Open the style via URL input
       await when.click("nav:open");