3 files changed, 33 insertions, 12 deletions
diff --git a/toolkit/mozapps/extensions/content/aboutaddons.css b/toolkit/mozapps/extensions/content/aboutaddons.css
index 3f4e80797a..2f5157bea3 100644
--- a/toolkit/mozapps/extensions/content/aboutaddons.css
+++ b/toolkit/mozapps/extensions/content/aboutaddons.css
@@ -643,12 +643,18 @@ panel-item[action="report"]::part(button) {
   text-decoration: none;
 }
 
-.inline-options-stack {
-  /* If the options browser triggers an alert we need room to show it. */
-  min-height: 250px;
+.addon-inline-options {
   width: 100%;
   background-color: white;
   margin-block: 4px;
+  /*
+   * Makes sure the browser minimal height is going to be the same as when
+   * this browser element was wrapper in a stack and a min-height was necessary
+   * for the prompts to fit inside the browser element.
+   * That stack element has been removed as part of Bug 1881055, but keeping
+   * the min-height unchanged to avoid potential regressions in the short term.
+   */
+  min-height: 250px;
 }
 
 addon-permissions-list > .addon-detail-row {
diff --git a/toolkit/mozapps/extensions/content/aboutaddons.js b/toolkit/mozapps/extensions/content/aboutaddons.js
index 37687a8be7..39c4656210 100644
--- a/toolkit/mozapps/extensions/content/aboutaddons.js
+++ b/toolkit/mozapps/extensions/content/aboutaddons.js
@@ -1423,10 +1423,23 @@ class SidebarFooter extends HTMLElement {
       labelL10nId: "addons-settings-button",
       onClick: e => {
         e.preventDefault();
-        windowRoot.ownerGlobal.switchToTabHavingURI("about:preferences", true, {
-          ignoreFragment: "whenComparing",
-          triggeringPrincipal: systemPrincipal,
-        });
+        let hasAboutSettings = windowRoot.ownerGlobal.switchToTabHavingURI(
+          "about:settings",
+          false,
+          {
+            ignoreFragment: "whenComparing",
+          }
+        );
+        if (!hasAboutSettings) {
+          windowRoot.ownerGlobal.switchToTabHavingURI(
+            "about:preferences",
+            true,
+            {
+              ignoreFragment: "whenComparing",
+              triggeringPrincipal: systemPrincipal,
+            }
+          );
+        }
       },
     });
 
@@ -1695,6 +1708,7 @@ class InlineOptionsBrowser extends HTMLElement {
     browser.setAttribute("disableglobalhistory", "true");
     browser.setAttribute("messagemanagergroup", "webext-browsers");
     browser.setAttribute("id", "addon-inline-options");
+    browser.setAttribute("class", "addon-inline-options");
     browser.setAttribute("transparent", "true");
     browser.setAttribute("forcemessagemanager", "true");
     browser.setAttribute("autocompletepopup", "PopupAutoComplete");
@@ -1731,10 +1745,7 @@ class InlineOptionsBrowser extends HTMLElement {
       readyPromise = promiseEvent("load", browser, true);
     }
 
-    let stack = document.createXULElement("stack");
-    stack.classList.add("inline-options-stack");
-    stack.appendChild(browser);
-    this.appendChild(stack);
+    this.appendChild(browser);
     this.browser = browser;
 
     // Force bindings to apply synchronously.
diff --git a/toolkit/mozapps/extensions/content/aboutaddonsCommon.js b/toolkit/mozapps/extensions/content/aboutaddonsCommon.js
index 739e7629d7..9315e35861 100644
--- a/toolkit/mozapps/extensions/content/aboutaddonsCommon.js
+++ b/toolkit/mozapps/extensions/content/aboutaddonsCommon.js
@@ -237,7 +237,11 @@ async function installAddonsFromFilePicker() {
   ]);
   const nsIFilePicker = Ci.nsIFilePicker;
   var fp = Cc["@mozilla.org/filepicker;1"].createInstance(nsIFilePicker);
-  fp.init(window, dialogTitle.value, nsIFilePicker.modeOpenMultiple);
+  fp.init(
+    window.browsingContext,
+    dialogTitle.value,
+    nsIFilePicker.modeOpenMultiple
+  );
   try {
     fp.appendFilter(filterName.value, "*.xpi;*.jar;*.zip");
     fp.appendFilters(nsIFilePicker.filterAll);