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diff --git a/browser/modules/OpenInTabsUtils.sys.mjs b/browser/modules/OpenInTabsUtils.sys.mjs
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+/* 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));
+ });
+ });
+ },
+};