--- a/browser/base/content/aboutNetError.xhtml
+++ b/browser/base/content/aboutNetError.xhtml
@@ -364,16 +364,19 @@
           var options = JSON.parse(event.detail);
           if (options && options.enabled) {
             // Display error reporting UI
             document.getElementById("certificateErrorReporting").style.display = "block";
 
             // set the checkbox
             checkbox.checked = !!options.automatic;
           }
+          if (options && options.hideAddExceptionButton) {
+            document.querySelector(".exceptionDialogButtonContainer").hidden = true;
+          }
         }, true, true);
 
         let event = new CustomEvent("AboutNetErrorLoad", {bubbles: true});
         document.getElementById("advancedButton").dispatchEvent(event);
       }
 
       /* Only do autofocus if we're the toplevel frame; otherwise we
          don't want to call attention to ourselves!  The key part is

--- a/browser/base/content/content.js
+++ b/browser/base/content/content.js
@@ -648,18 +648,22 @@ var AboutNetAndCertErrorListener = {
      }
      return msg;
    },
 
   onPageLoad(originalTarget, win) {
     // Values for telemtery bins: see TLS_ERROR_REPORT_UI in Histograms.json
     const TLS_ERROR_REPORT_TELEMETRY_UI_SHOWN = 0;
 
+    let hideAddExceptionButton = false;
+
     if (this.isAboutCertError(win.document)) {
       ClickEventHandler.onCertError(originalTarget, win);
+      hideAddExceptionButton =
+        Services.prefs.getBoolPref("security.certerror.hideAddException", false);
     }
     if (this.isAboutNetError(win.document)) {
       let docShell = win.document.docShell;
       if (docShell) {
         let {securityInfo} = docShell.failedChannel;
         // We don't have a securityInfo when this is for example a DNS error.
         if (securityInfo) {
           securityInfo.QueryInterface(Ci.nsITransportSecurityInfo);
@@ -671,17 +675,18 @@ var AboutNetAndCertErrorListener = {
       }
     }
 
     let automatic = Services.prefs.getBoolPref("security.ssl.errorReporting.automatic");
     win.dispatchEvent(new win.CustomEvent("AboutNetErrorOptions", {
       detail: JSON.stringify({
         enabled: Services.prefs.getBoolPref("security.ssl.errorReporting.enabled"),
         changedCertPrefs: this.changedCertPrefs(),
-        automatic
+        automatic,
+        hideAddExceptionButton,
       })
     }));
 
     sendAsyncMessage("Browser:SSLErrorReportTelemetry",
                      {reportStatus: TLS_ERROR_REPORT_TELEMETRY_UI_SHOWN});
   },
 
   openCaptivePortalPage(evt) {
@@ -729,17 +734,17 @@ var ClickEventHandler = {
 
     let originalTarget = event.originalTarget;
     let ownerDoc = originalTarget.ownerDocument;
     if (!ownerDoc) {
       return;
     }
 
     // Handle click events from about pages
-    if (event.button == 0) {
+    if (event.button == 0 && !originalTarget.disabled) {
       if (AboutNetAndCertErrorListener.isAboutCertError(ownerDoc)) {
         this.onCertError(originalTarget, ownerDoc.defaultView);
         return;
       } else if (ownerDoc.documentURI.startsWith("about:blocked")) {
         this.onAboutBlocked(originalTarget, ownerDoc);
         return;
       } else if (AboutNetAndCertErrorListener.isAboutNetError(ownerDoc)) {
         this.onAboutNetError(event, ownerDoc.documentURI);

--- a/browser/base/content/test/about/browser_aboutCertError.js
+++ b/browser/base/content/test/about/browser_aboutCertError.js
@@ -285,16 +285,19 @@ add_task(async function checkAdvancedDet
     let message = await ContentTask.spawn(browser, {frame: useFrame}, async function({frame}) {
       let doc = frame ? content.document.querySelector("iframe").contentDocument : content.document;
 
       let shortDescText = doc.getElementById("errorShortDescText");
       info("Main error text: " + shortDescText.textContent);
       ok(shortDescText.textContent.includes("expired.example.com"),
          "Should list hostname in error message.");
 
+      let exceptionButton = doc.getElementById("exceptionDialogButton");
+      ok(!exceptionButton.disabled, "Exception button is not disabled by default.");
+
       let advancedButton = doc.getElementById("advancedButton");
       advancedButton.click();
       let el = doc.getElementById("errorCode");
       return { textContent: el.textContent, tagName: el.tagName };
     });
     is(message.textContent, "SEC_ERROR_EXPIRED_CERTIFICATE",
        "Correct error message found");
     is(message.tagName, "a", "Error message is a link");
@@ -329,16 +332,37 @@ add_task(async function checkAdvancedDet
        "Correct HPKP value found");
     let certChain = getCertChain(message.securityInfoAsString);
     ok(message.text.includes(certChain), "Found certificate chain");
 
     BrowserTestUtils.removeTab(gBrowser.selectedTab);
   }
 });
 
+add_task(async function checkhideAddExceptionButton() {
+  info("Loading a bad cert page and verifying the pref security.certerror.hideAddException");
+  Services.prefs.setBoolPref("security.certerror.hideAddException", true);
+
+  for (let useFrame of [false, true]) {
+    let tab = await openErrorPage(BAD_CERT, useFrame);
+    let browser = tab.linkedBrowser;
+
+    await ContentTask.spawn(browser, {frame: useFrame}, async function({frame}) {
+      let doc = frame ? content.document.querySelector("iframe").contentDocument : content.document;
+
+      let exceptionButton = doc.querySelector(".exceptionDialogButtonContainer");
+      ok(exceptionButton.hidden, "Exception button is hidden.");
+    });
+
+    BrowserTestUtils.removeTab(gBrowser.selectedTab);
+  }
+
+  Services.prefs.clearUserPref("security.certerror.hideAddException");
+});
+
 add_task(async function checkAdvancedDetailsForHSTS() {
   info("Loading a bad STS cert page and verifying the advanced details section");
   for (let useFrame of [false, true]) {
     let tab = await openErrorPage(BAD_STS_CERT, useFrame);
     let browser = tab.linkedBrowser;
 
     let message = await ContentTask.spawn(browser, {frame: useFrame}, async function({frame}) {
       let doc = frame ? content.document.querySelector("iframe").contentDocument : content.document;

--- a/browser/themes/shared/aboutNetError.css
+++ b/browser/themes/shared/aboutNetError.css
@@ -156,16 +156,20 @@ span#hostname {
 
 .exceptionDialogButtonContainer {
   background-color: var(--exception-button-container-background);
   display: flex;
   justify-content: end;
   padding: 10px;
 }
 
+.exceptionDialogButtonContainer[hidden] {
+  display: none;
+}
+
 .illustrated #errorPageContainer {
   min-height: 300px;
   display: flex;
   flex-direction: column;
   background-position: left center;
 }
 
 .illustrated[dir="rtl"] #errorPageContainer {