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diff --git a/toolkit/components/pdfjs/test/browser_pdfjs_fill_login.js b/toolkit/components/pdfjs/test/browser_pdfjs_fill_login.js
new file mode 100644
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+++ b/toolkit/components/pdfjs/test/browser_pdfjs_fill_login.js
@@ -0,0 +1,108 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+const RELATIVE_DIR = "toolkit/components/pdfjs/test/";
+const TESTROOT = "http://example.com/browser/" + RELATIVE_DIR;
+
+// This is a modified version from browser_contextmenuFillLogins.js.
+async function openContextMenuForSelector(browser, selector) {
+  const doc = browser.ownerDocument;
+  const CONTEXT_MENU = doc.getElementById("contentAreaContextMenu");
+
+  let contextMenuShownPromise = BrowserTestUtils.waitForEvent(
+    CONTEXT_MENU,
+    "popupshown"
+  );
+
+  let inputCoords = await SpecialPowers.spawn(
+    browser,
+    [selector],
+    async selector => {
+      let input = content.document.querySelector(selector);
+      input.focus();
+      let inputRect = input.getBoundingClientRect();
+
+      // listen for the contextmenu event so we can assert on receiving it
+      // and examine the target
+      content.contextmenuPromise = new Promise(resolve => {
+        content.document.body.addEventListener(
+          "contextmenu",
+          event => {
+            info(
+              `Received event on target: ${event.target.nodeName}, type: ${event.target.type}`
+            );
+            content.console.log("got contextmenu event: ", event);
+            resolve(event);
+          },
+          { once: true }
+        );
+      });
+
+      let coords = {
+        x: inputRect.x + inputRect.width / 2,
+        y: inputRect.y + inputRect.height / 2,
+      };
+      return coords;
+    }
+  );
+
+  // add the offsets of the <browser> in the chrome window
+  let browserOffsets = browser.getBoundingClientRect();
+  let offsetX = browserOffsets.x + inputCoords.x;
+  let offsetY = browserOffsets.y + inputCoords.y;
+
+  // Synthesize a right mouse click over the input element, we have to trigger
+  // both events because formfill code relies on this event happening before the contextmenu
+  // (which it does for real user input) in order to not show the password autocomplete.
+  let eventDetails = { type: "mousedown", button: 2 };
+  await EventUtils.synthesizeMouseAtPoint(offsetX, offsetY, eventDetails);
+
+  // Synthesize a contextmenu event to actually open the context menu.
+  eventDetails = { type: "contextmenu", button: 2 };
+  await EventUtils.synthesizeMouseAtPoint(offsetX, offsetY, eventDetails);
+
+  await SpecialPowers.spawn(browser, [], async () => {
+    await content.contextmenuPromise;
+  });
+
+  info("waiting for contextMenuShownPromise");
+
+  await contextMenuShownPromise;
+  return CONTEXT_MENU;
+}
+
+/**
+ * Ensure the fill login context menu is not shown for PDF.js forms.
+ */
+add_task(async function test_filllogin() {
+  await SpecialPowers.pushPrefEnv({
+    set: [["pdfjs.renderInteractiveForms", true]],
+  });
+
+  await BrowserTestUtils.withNewTab(
+    { gBrowser, url: "about:blank" },
+    async function (browser) {
+      await waitForPdfJSAnnotationLayer(
+        browser,
+        TESTROOT + "file_pdfjs_form.pdf"
+      );
+
+      let contextMenu = await openContextMenuForSelector(
+        browser,
+        "#viewerContainer input"
+      );
+      let fillItem = contextMenu.querySelector("#fill-login");
+      ok(fillItem, "fill menu item exists");
+      ok(fillItem && EventUtils.isHidden(fillItem), "fill menu item is hidden");
+
+      let promiseHidden = BrowserTestUtils.waitForEvent(
+        contextMenu,
+        "popuphidden"
+      );
+      info("Calling hidePopup on contextMenu");
+      contextMenu.hidePopup();
+      info("waiting for promiseHidden");
+      await promiseHidden;
+    }
+  );
+});