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diff --git a/devtools/client/debugger/src/utils/tabs.js b/devtools/client/debugger/src/utils/tabs.js
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+++ b/devtools/client/debugger/src/utils/tabs.js
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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/>. */
+
+/*
+ * Finds the hidden tabs by comparing the tabs' top offset.
+ * hidden tabs will have a great top offset.
+ *
+ * @param sourceTabs Array
+ * @param sourceTabEls HTMLCollection
+ *
+ * @returns Array
+ */
+
+export function getHiddenTabs(sourceTabs, sourceTabEls) {
+  sourceTabEls = [].slice.call(sourceTabEls);
+  function getTopOffset() {
+    const topOffsets = sourceTabEls.map(t => t.getBoundingClientRect().top);
+    return Math.min(...topOffsets);
+  }
+
+  function hasTopOffset(el) {
+    // adding 10px helps account for cases where the tab might be offset by
+    // styling such as selected tabs which don't have a border.
+    const tabTopOffset = getTopOffset();
+    return el.getBoundingClientRect().top > tabTopOffset + 10;
+  }
+
+  return sourceTabs.filter((tab, index) => {
+    const element = sourceTabEls[index];
+    return element && hasTopOffset(element);
+  });
+}
+
+export function getTabMenuItems() {
+  return {
+    closeTab: {
+      id: "node-menu-close-tab",
+      label: L10N.getStr("sourceTabs.closeTab"),
+      accesskey: L10N.getStr("sourceTabs.closeTab.accesskey"),
+      disabled: false,
+    },
+    closeOtherTabs: {
+      id: "node-menu-close-other-tabs",
+      label: L10N.getStr("sourceTabs.closeOtherTabs"),
+      accesskey: L10N.getStr("sourceTabs.closeOtherTabs.accesskey"),
+      disabled: false,
+    },
+    closeTabsToEnd: {
+      id: "node-menu-close-tabs-to-end",
+      label: L10N.getStr("sourceTabs.closeTabsToEnd"),
+      accesskey: L10N.getStr("sourceTabs.closeTabsToEnd.accesskey"),
+      disabled: false,
+    },
+    closeAllTabs: {
+      id: "node-menu-close-all-tabs",
+      label: L10N.getStr("sourceTabs.closeAllTabs"),
+      accesskey: L10N.getStr("sourceTabs.closeAllTabs.accesskey"),
+      disabled: false,
+    },
+    showSource: {
+      id: "node-menu-show-source",
+      label: L10N.getStr("sourceTabs.revealInTree"),
+      accesskey: L10N.getStr("sourceTabs.revealInTree.accesskey"),
+      disabled: false,
+    },
+    copySource: {
+      id: "node-menu-copy-source",
+      label: L10N.getStr("copySource.label"),
+      accesskey: L10N.getStr("copySource.accesskey"),
+      disabled: false,
+    },
+    copySourceUri2: {
+      id: "node-menu-copy-source-url",
+      label: L10N.getStr("copySourceUri2"),
+      accesskey: L10N.getStr("copySourceUri2.accesskey"),
+      disabled: false,
+    },
+    toggleBlackBox: {
+      id: "node-menu-blackbox",
+      label: L10N.getStr("ignoreContextItem.ignore"),
+      accesskey: L10N.getStr("ignoreContextItem.ignore.accesskey"),
+      disabled: false,
+    },
+    prettyPrint: {
+      id: "node-menu-pretty-print",
+      label: L10N.getStr("sourceTabs.prettyPrint"),
+      accesskey: L10N.getStr("sourceTabs.prettyPrint.accesskey"),
+      disabled: false,
+    },
+  };
+}
+
+/**
+ * Determines if a tab exists with the following properties
+ *
+ * @param {Object} tab
+ * @param {String} url
+ * @param {Boolean} isOriginal
+ */
+export function isSimilarTab(tab, url, isOriginal) {
+  return tab.url === url && tab.isOriginal === isOriginal;
+}
+
+/**
+ * This cleans up some tab info (source id and thread info),
+ * mostly for persiting to pref and for navigation or reload.
+ * This is neccesary because the source and thread are destroyed
+ * and re-created across navigations / reloads.
+ *
+ * @param {Array} tabs
+ */
+export function persistTabs(tabs) {
+  return [...tabs]
+    .filter(tab => tab.url)
+    .map(tab => ({
+      ...tab,
+      source: null,
+      sourceActor: null,
+    }));
+}