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diff --git a/toolkit/components/pdfjs/test/browser_pdfjs_minimum_font_size.js b/toolkit/components/pdfjs/test/browser_pdfjs_minimum_font_size.js
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+++ b/toolkit/components/pdfjs/test/browser_pdfjs_minimum_font_size.js
@@ -0,0 +1,70 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+const RELATIVE_DIR = "toolkit/components/pdfjs/test/";
+const TESTROOT = "https://example.com/browser/" + RELATIVE_DIR;
+
+/**
+ * Test that the pdf doesn't use the minimum font size.
+ */
+add_task(async function test() {
+  let mimeService = Cc["@mozilla.org/mime;1"].getService(Ci.nsIMIMEService);
+  let handlerInfo = mimeService.getFromTypeAndExtension(
+    "application/pdf",
+    "pdf"
+  );
+
+  // Make sure pdf.js is the default handler.
+  is(
+    handlerInfo.alwaysAskBeforeHandling,
+    false,
+    "pdf handler defaults to always-ask is false"
+  );
+  is(
+    handlerInfo.preferredAction,
+    Ci.nsIHandlerInfo.handleInternally,
+    "pdf handler defaults to internal"
+  );
+
+  info("Pref action: " + handlerInfo.preferredAction);
+
+  await SpecialPowers.pushPrefEnv({
+    set: [["font.minimum-size.x-western", 56]],
+  });
+
+  await BrowserTestUtils.withNewTab(
+    { gBrowser, url: "about:blank" },
+    async function (browser) {
+      // check that PDF is opened with internal viewer
+      await waitForPdfJSAllLayers(
+        browser,
+        `${TESTROOT}file_pdfjs_test.pdf#zoom=10`,
+        []
+      );
+
+      await SpecialPowers.spawn(browser, [true], () => {
+        const pageNumberInput = content.document.querySelector("#pageNumber");
+        const { style } = pageNumberInput;
+        const baseHeight =
+          content.document.defaultView.getComputedStyle(pageNumberInput).height;
+
+        style.fontSize = "1px";
+        const height =
+          content.document.defaultView.getComputedStyle(pageNumberInput).height;
+
+        // Changing the font size should change the height of the input
+        // element. If the minimum font size is used, the height won't change.
+        Assert.notEqual(
+          baseHeight,
+          height,
+          "The pdf viewer musn't use the minimum font size."
+        );
+      });
+
+      await SpecialPowers.spawn(browser, [], async function () {
+        var viewer = content.wrappedJSObject.PDFViewerApplication;
+        await viewer.close();
+      });
+    }
+  );
+});