1 files changed, 77 insertions, 0 deletions
diff --git a/browser/modules/OpenInTabsUtils.sys.mjs b/browser/modules/OpenInTabsUtils.sys.mjs
new file mode 100644
index 0000000000..bea547d915
--- /dev/null
+++ b/browser/modules/OpenInTabsUtils.sys.mjs
@@ -0,0 +1,77 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+const lazy = {};
+
+ChromeUtils.defineLazyGetter(lazy, "l10n", () => {
+  return new Localization(
+    ["browser/tabbrowser.ftl", "branding/brand.ftl"],
+    true
+  );
+});
+
+/**
+ * Utility functions that can be used when opening multiple tabs, that can be
+ * called without any tabbrowser instance.
+ */
+export const OpenInTabsUtils = {
+  /**
+   * Gives the user a chance to cancel loading lots of tabs at once.
+   */
+  confirmOpenInTabs(numTabsToOpen, aWindow) {
+    const WARN_ON_OPEN_PREF = "browser.tabs.warnOnOpen";
+    const MAX_OPNE_PREF = "browser.tabs.maxOpenBeforeWarn";
+    if (!Services.prefs.getBoolPref(WARN_ON_OPEN_PREF)) {
+      return true;
+    }
+    if (numTabsToOpen < Services.prefs.getIntPref(MAX_OPNE_PREF)) {
+      return true;
+    }
+
+    // default to true: if it were false, we wouldn't get this far
+    let warnOnOpen = { value: true };
+
+    const [title, message, button, checkbox] = lazy.l10n.formatMessagesSync([
+      { id: "tabbrowser-confirm-open-multiple-tabs-title" },
+      {
+        id: "tabbrowser-confirm-open-multiple-tabs-message",
+        args: { tabCount: numTabsToOpen },
+      },
+      { id: "tabbrowser-confirm-open-multiple-tabs-button" },
+      { id: "tabbrowser-confirm-open-multiple-tabs-checkbox" },
+    ]);
+
+    let buttonPressed = Services.prompt.confirmEx(
+      aWindow,
+      title.value,
+      message.value,
+      Services.prompt.BUTTON_TITLE_IS_STRING * Services.prompt.BUTTON_POS_0 +
+        Services.prompt.BUTTON_TITLE_CANCEL * Services.prompt.BUTTON_POS_1,
+      button.value,
+      null,
+      null,
+      checkbox.value,
+      warnOnOpen
+    );
+
+    let reallyOpen = buttonPressed == 0;
+    // don't set the pref unless they press OK and it's false
+    if (reallyOpen && !warnOnOpen.value) {
+      Services.prefs.setBoolPref(WARN_ON_OPEN_PREF, false);
+    }
+
+    return reallyOpen;
+  },
+
+  /*
+   * Async version of confirmOpenInTabs.
+   */
+  promiseConfirmOpenInTabs(numTabsToOpen, aWindow) {
+    return new Promise(resolve => {
+      Services.tm.dispatchToMainThread(() => {
+        resolve(this.confirmOpenInTabs(numTabsToOpen, aWindow));
+      });
+    });
+  },
+};