diff --git a/browser-extension/chrome-extension-test/tests/testcase.spec.ts b/browser-extension/chrome-extension-test/tests/testcase.spec.ts
index e62a97c..2f3db0d 100644
--- a/browser-extension/chrome-extension-test/tests/testcase.spec.ts
+++ b/browser-extension/chrome-extension-test/tests/testcase.spec.ts
@@ -130,3 +130,11 @@ test.describe('A dialog should be displayed if the test cases size is too big',
         await expect(page.locator('#task-statement').locator('div.part')).toHaveCount(58, {timeout: 60 * 1000});
     });
 });
+
+test.describe('Do not show the download test cases button on a page that is not a problem statement page', () => {
+    test('Do not show in the editorial page', async () => {
+        await page.goto('https://atcoder.jp/contests/dp/tasks/dp_a/editorial');
+        const button = page.locator('text=/^Download all test cases.*/');
+        await expect(button).toHaveCount(0);
+    });
+});
diff --git a/browser-extension/chrome-extension/firefox_manifest.json b/browser-extension/chrome-extension/firefox_manifest.json
index 6466eda..c3a5114 100644
--- a/browser-extension/chrome-extension/firefox_manifest.json
+++ b/browser-extension/chrome-extension/firefox_manifest.json
@@ -37,10 +37,15 @@
         },
         {
             "js": [
+                "scripts/shared/testcase_mapping.js",
                 "scripts/testcase/main.js"
             ],
             "matches": [
-                "*://atcoder.jp/contests/*/tasks/a*"
+                "*://atcoder.jp/contests/*/tasks/*"
+            ],
+            "exclude_matches": [
+                "*://atcoder.jp/contests/*/tasks/",
+                "*://atcoder.jp/contests/*/tasks/*/*"
             ]
         },
         {
@@ -56,6 +61,7 @@
         },
         {
             "js": [
+                "scripts/shared/testcase_mapping.js",
                 "scripts/submission-details/problem-info.js",
                 "scripts/submission-details/testcase-downloader.js",
                 "scripts/submission-details/dom.js",
diff --git a/browser-extension/chrome-extension/manifest.json b/browser-extension/chrome-extension/manifest.json
index c08f206..df35d18 100644
--- a/browser-extension/chrome-extension/manifest.json
+++ b/browser-extension/chrome-extension/manifest.json
@@ -48,7 +48,8 @@
                 "*://atcoder.jp/contests/*/tasks/*"
             ],
             "exclude_matches": [
-                "*://atcoder.jp/contests/*/tasks/"
+                "*://atcoder.jp/contests/*/tasks/",
+                "*://atcoder.jp/contests/*/tasks/*/*"
             ]
         },
         {