diff --git a/uriloader/exthandler/tests/mochitest/browser.ini b/uriloader/exthandler/tests/mochitest/browser.ini
index 973fa8c03b00..fdb194fcda45 100644
--- a/uriloader/exthandler/tests/mochitest/browser.ini
+++ b/uriloader/exthandler/tests/mochitest/browser.ini
@@ -97,9 +97,6 @@ support-files =
 support-files =
   redirect_helper.sjs
 [browser_protocol_ask_dialog_permission.js]
-support-files =
-  redirect_helper.sjs
-  script_redirect.html
 [browser_protocolhandler_loop.js]
 [browser_remember_download_option.js]
 [browser_txt_download_save_as.js]
diff --git a/uriloader/exthandler/tests/mochitest/browser_protocol_ask_dialog_permission.js b/uriloader/exthandler/tests/mochitest/browser_protocol_ask_dialog_permission.js
index b8a115c0c729..8a9fc5876fbe 100644
--- a/uriloader/exthandler/tests/mochitest/browser_protocol_ask_dialog_permission.js
+++ b/uriloader/exthandler/tests/mochitest/browser_protocol_ask_dialog_permission.js
@@ -7,11 +7,6 @@ let gHandlerService = Cc["@mozilla.org/uriloader/handler-service;1"].getService(
   Ci.nsIHandlerService
 );
 
-const ROOT_PATH = getRootDirectory(gTestPath).replace(
-  "chrome://mochitests/content/",
-  ""
-);
-
 // Testing multiple protocol / origin combinations takes long on debug.
 requestLongerTimeout(3);
 
@@ -125,9 +120,6 @@ async function triggerOpenProto(
     useNullPrincipal = false,
     useExtensionPrincipal = false,
     omitTriggeringPrincipal = false,
-    useJSRedirect = false,
-    serverRedirect = "",
-    linkToRedirect = false,
   } = {}
 ) {
   let uri = `${scheme}://test`;
@@ -180,65 +172,6 @@ async function triggerOpenProto(
     return;
   }
 
-  if (useJSRedirect) {
-    let innerParams = new URLSearchParams();
-    innerParams.set("uri", uri);
-    let params = new URLSearchParams();
-    params.set(
-      "uri",
-      "https://example.com/" +
-        ROOT_PATH +
-        "script_redirect.html?" +
-        innerParams.toString()
-    );
-    uri =
-      "https://example.org/" +
-      ROOT_PATH +
-      "script_redirect.html?" +
-      params.toString();
-    BrowserTestUtils.loadURI(browser, uri);
-    return;
-  }
-
-  if (serverRedirect) {
-    let innerParams = new URLSearchParams();
-    innerParams.set("uri", uri);
-    innerParams.set("redirectType", serverRedirect);
-    let params = new URLSearchParams();
-    params.set(
-      "uri",
-      "https://example.com/" +
-        ROOT_PATH +
-        "redirect_helper.sjs?" +
-        innerParams.toString()
-    );
-    uri =
-      "https://example.org/" +
-      ROOT_PATH +
-      "redirect_helper.sjs?" +
-      params.toString();
-    BrowserTestUtils.loadURI(browser, uri);
-    return;
-  }
-
-  if (linkToRedirect) {
-    let params = new URLSearchParams();
-    params.set("uri", uri);
-    uri =
-      "https://example.com/" +
-      ROOT_PATH +
-      "redirect_helper.sjs?" +
-      params.toString();
-    await ContentTask.spawn(browser, { uri }, args => {
-      let textLink = content.document.createElement("a");
-      textLink.href = args.uri;
-      textLink.textContent = "click me";
-      content.document.body.appendChild(textLink);
-      textLink.click();
-    });
-    return;
-  }
-
   info("Loading uri: " + uri);
   browser.loadURI(uri, { triggeringPrincipal });
 }
@@ -296,7 +229,6 @@ async function testOpenProto(
 
     let {
       hasCheckbox,
-      checkboxOrigin,
       hasChangeApp,
       chooserIsNext,
       actionCheckbox,
@@ -322,7 +254,6 @@ async function testOpenProto(
     await testCheckbox(dialogEl, dialogType, {
       hasCheckbox,
       actionCheckbox,
-      checkboxOrigin,
     });
 
     // Check the button label depending on whether we would show the chooser
@@ -380,11 +311,7 @@ async function testOpenProto(
   }
 
   // Clean up test extension if needed.
-  if (testExtension) {
-    await testExtension.unload();
-    // Don't try to unload it again later!
-    testExtension = null;
-  }
+  await testExtension?.unload();
 }
 
 /**
@@ -403,7 +330,7 @@ async function testOpenProto(
 async function testCheckbox(
   dialogEl,
   dialogType,
-  { hasCheckbox, hasCheckboxState = false, actionCheckbox, checkboxOrigin }
+  { hasCheckbox, hasCheckboxState = false, actionCheckbox }
 ) {
   let checkbox = dialogEl.ownerDocument.getElementById("remember");
   if (typeof hasCheckbox == "boolean") {
@@ -431,14 +358,6 @@ async function testCheckbox(
     is(checkbox.checked, hasCheckboxState, "Dialog checkbox has correct state");
   }
 
-  if (checkboxOrigin) {
-    let doc = dialogEl.ownerDocument;
-    let hostFromLabel = doc.l10n.getAttributes(
-      doc.getElementById("remember-label")
-    ).args.host;
-    is(hostFromLabel, checkboxOrigin, "Checkbox should be for correct domain.");
-  }
-
   if (typeof actionCheckbox == "boolean") {
     checkbox.click();
   }
@@ -849,103 +768,3 @@ add_task(async function test_extension_principal() {
     });
   });
 });
-
-/**
- * Test that we use the redirect principal for the dialog when applicable.
- */
-add_task(async function test_redirect_principal() {
-  let scheme = TEST_PROTOS[0];
-  await BrowserTestUtils.withNewTab("about:blank", async browser => {
-    await testOpenProto(browser, scheme, {
-      loadOptions: {
-        serverRedirect: "location",
-      },
-      permDialogOptions: {
-        checkboxOrigin: ORIGIN1,
-        chooserIsNext: true,
-        hasCheckbox: true,
-        actionConfirm: false, // Cancel dialog
-      },
-    });
-  });
-});
-
-/**
- * Test that we use the redirect principal for the dialog for refresh headers.
- */
-add_task(async function test_redirect_principal() {
-  let scheme = TEST_PROTOS[0];
-  await BrowserTestUtils.withNewTab("about:blank", async browser => {
-    await testOpenProto(browser, scheme, {
-      loadOptions: {
-        serverRedirect: "refresh",
-      },
-      permDialogOptions: {
-        checkboxOrigin: ORIGIN1,
-        chooserIsNext: true,
-        hasCheckbox: true,
-        actionConfirm: false, // Cancel dialog
-      },
-    });
-  });
-});
-
-/**
- * Test that we use the redirect principal for the dialog for meta refreshes.
- */
-add_task(async function test_redirect_principal() {
-  let scheme = TEST_PROTOS[0];
-  await BrowserTestUtils.withNewTab("about:blank", async browser => {
-    await testOpenProto(browser, scheme, {
-      loadOptions: {
-        serverRedirect: "meta-refresh",
-      },
-      permDialogOptions: {
-        checkboxOrigin: ORIGIN1,
-        chooserIsNext: true,
-        hasCheckbox: true,
-        actionConfirm: false, // Cancel dialog
-      },
-    });
-  });
-});
-
-/**
- * Test that we use the redirect principal for the dialog for JS redirects.
- */
-add_task(async function test_redirect_principal_js() {
-  let scheme = TEST_PROTOS[0];
-  await BrowserTestUtils.withNewTab("about:blank", async browser => {
-    await testOpenProto(browser, scheme, {
-      loadOptions: {
-        useJSRedirect: true,
-      },
-      permDialogOptions: {
-        checkboxOrigin: ORIGIN1,
-        chooserIsNext: true,
-        hasCheckbox: true,
-        actionConfirm: false, // Cancel dialog
-      },
-    });
-  });
-});
-
-/**
- * Test that we use the redirect principal for the dialog for link clicks.
- */
-add_task(async function test_redirect_principal_links() {
-  let scheme = TEST_PROTOS[0];
-  await BrowserTestUtils.withNewTab("about:blank", async browser => {
-    await testOpenProto(browser, scheme, {
-      loadOptions: {
-        linkToRedirect: true,
-      },
-      permDialogOptions: {
-        checkboxOrigin: ORIGIN1,
-        chooserIsNext: true,
-        hasCheckbox: true,
-        actionConfirm: false, // Cancel dialog
-      },
-    });
-  });
-});
diff --git a/uriloader/exthandler/tests/mochitest/redirect_helper.sjs b/uriloader/exthandler/tests/mochitest/redirect_helper.sjs
index 5c1068bebbc2..bf96b213eb71 100644
--- a/uriloader/exthandler/tests/mochitest/redirect_helper.sjs
+++ b/uriloader/exthandler/tests/mochitest/redirect_helper.sjs
@@ -6,25 +6,9 @@
 Cu.importGlobalProperties(["URLSearchParams"]);
 
 function handleRequest(request, response) {
-  let params = new URLSearchParams(request.queryString);
-  let uri = params.get("uri");
-  let redirectType = params.get("redirectType") || "location";
-  switch (redirectType) {
-    case "refresh":
-      response.setStatusLine(request.httpVersion, 200, "OK");
-      response.setHeader("Refresh", "0; url=" + uri);
-      break;
-
-    case "meta-refresh":
-      response.setStatusLine(request.httpVersion, 200, "OK");
-      response.setHeader("Content-Type", "text/html");
-      response.write(`<meta http-equiv="refresh" content="0; url=${uri}">`);
-      break;
-
-    case "location":
-    // fall through
-    default:
-      response.setStatusLine(request.httpVersion, 302, "Moved Temporarily");
-      response.setHeader("Location", uri);
-  }
+  response.setStatusLine(request.httpVersion, 302, "Moved Temporarily");
+  response.setHeader(
+    "Location",
+    new URLSearchParams(request.queryString).get("uri")
+  );
 }
diff --git a/uriloader/exthandler/tests/mochitest/script_redirect.html b/uriloader/exthandler/tests/mochitest/script_redirect.html
deleted file mode 100644
index 31e0dc6a7eae..000000000000
--- a/uriloader/exthandler/tests/mochitest/script_redirect.html
+++ /dev/null
@@ -1,5 +0,0 @@
-<script>
-  let params = new URL(document.location).searchParams;
-  let uri = params.get("uri");
-  document.location = uri;
-</script>