This file is indexed.

/usr/share/xul-ext/tabmixplus/modules/RenameTab.jsm is in xul-ext-tabmixplus 0.5.0.0-1~deb8u1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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"use strict";

this.EXPORTED_SYMBOLS = ["RenameTab"];

const Cu = Components.utils;

Cu.import("resource://gre/modules/XPCOMUtils.jsm");
Cu.import("resource://tabmixplus/Services.jsm");

XPCOMUtils.defineLazyModuleGetter(this, "TabmixPlacesUtils",
  "resource://tabmixplus/Places.jsm");

this.RenameTab = {
  window: null,
  panel: null,
  data: {},
  _element: function(aID) {
    return this.window.document.getElementById(aID);
  },

  editTitle: function(aTab) {
    if (this.panel && this.panel.state != "closed")
      this.hidePopup();

    this.window = aTab.ownerDocument.defaultView;
    var gBrowser = this.window.gBrowser;

    this.data.tab = aTab = aTab.localName == "tab" ? aTab : gBrowser.mCurrentTab;
    var browser = gBrowser.getBrowserForTab(aTab);
    let docTitle = aTab.hasAttribute("pending") ?
          this.window.TMP_SessionStore.getTitleFromTabState(aTab) :
          browser.contentTitle;
    this.data.url = browser.currentURI.spec;
    this.data.docTitle = TabmixPlacesUtils.getTitleFromBookmark(this.data.url,
        docTitle, null, aTab);
    if (!this.data.docTitle)
      this.data.docTitle = this.window.isBlankPageURL(this.data.url) ?
        gBrowser.mStringBundle.getString("tabs.emptyTabTitle") : this.data.url;
    this.data.modified = aTab.getAttribute("label-uri") || null;
    if (this.data.modified == this.data.url || this.data.modified == "*")
      this.data.value = aTab.getAttribute("fixed-label");
    else
      this.data.value = this.data.docTitle;

    this.showPanel();
  },

  showPanel: function TMP_renametab_showPanel() {
    var popup = this._element("tabmixRenametab_panel");
    if (popup) {
      if (popup._overlayLoaded) {
        this.panel = popup;
        this._doShowPanel();
      }
      return;
    }

    popup = this.panel = this.window.document.createElement("panel");
    popup._overlayLoaded = false;
    popup.id = "tabmixRenametab_panel";
    this._element("mainPopupSet").appendChild(popup);
    this.window.document.loadOverlay(
      "chrome://tabmixplus/content/minit/renameTab.xul", this
    );
  },

  observe: function(aSubject, aTopic) {
    if (aTopic != "xul-overlay-merged")
      return;

    this.panel._overlayLoaded = true;
    this.panel.hidden = false;

    this._element("tabmixRenametab_deleteButton").label = TabmixSvc.getDialogStrings("Cancel");

    // reorder buttons for MacOS & Linux
    if (TabmixSvc.isLinux || TabmixSvc.isMac) {
      let buttons = this._element("tabmixRenametab_buttons");
      buttons.removeAttribute("pack");
      buttons.setAttribute("dir", "rtl");
    }

    this._doShowPanel();
  },

  _doShowPanel: function() {
    var popup = this.panel;
    popup.addEventListener("keypress", this, false);
    // dock the panel to the tab icon when possible, otherwise show the panel
    // at screen center
    if (this.window.Tabmix.tabsUtils.isElementVisible(this.data.tab))
      popup.openPopup(this.data.tab, "bottomcenter topleft");
    else {
      let screen = this.window.screen;
      let width = popup.boxObject.width || 330;
      let height = popup.boxObject.height || 215;
      popup.openPopupAtScreen(screen.availLeft + (screen.availWidth - width) / 2,
          screen.availTop + (screen.availHeight - height) / 2, false);
      if (popup.boxObject.width != width) {
        popup.moveTo(screen.availLeft + (screen.availWidth - popup.boxObject.width) / 2,
            screen.availTop + (screen.availHeight - popup.boxObject.height) / 2);
      }
    }

    var image = this.data.tab.linkedBrowser.mIconURL || "chrome://tabmixplus/skin/tmp.png";
    this._element("tabmixRenametab_icon").setAttribute("src", image);
    this._element("tabmixRenametab_titleField").value = this.data.value;
    this._element("tabmixRenametab_defaultField").value = this.data.docTitle;
    this.window.Tabmix.setItem(popup, "modified", this.data.modified);
    var permanently = this._element("tabmixRenametab_checkbox");
    if (this.data.modified)
      permanently.checked = this.data.modified == "*";

    this.data.permanently = permanently.checked;
  },

  resetTitle: function() {
    this.data.value = this.data.docTitle;
    this.update(true);
  },

  update: function(aReset) {
    var data = this.data;
    var tab = data.tab;
    var label = data.value;
    var resetDefault = aReset || (label == data.docTitle && !data.permanently);
    var url = resetDefault ? null : data.permanently ? "*" : data.url;

    var win = this.window;
    win.Tabmix.setItem(tab, "fixed-label", resetDefault ? null : label);
    win.Tabmix.setItem(tab, "label-uri", url);
    TabmixSvc.saveTabAttributes(tab, "fixed-label,label-uri");
    win.TabmixSessionManager.updateTabProp(tab);

    if (tab.label != label)
      win.gBrowser.setTabTitle(tab);

    this.hidePopup();
  },

  handleEvent: function(aEvent) {
    if (aEvent.type == "keypress" &&
         aEvent.keyCode == Components.interfaces.nsIDOMKeyEvent.DOM_VK_RETURN &&
         aEvent.target.localName != "button")
      this.update();
  },

  onpopupshown: function(aEvent) {
    if (aEvent.target == this.panel) {
      var textbox = this._element("tabmixRenametab_titleField");
      textbox.focus();
      textbox.select();
    }
  },

  onpopuphidden: function(aEvent) {
    if (aEvent.originalTarget == this.panel) {
      this.panel.removeEventListener("keypress", this, false);
      this.window = null;
      this.panel = null;
      this.data = {};
    }
  },

  onNewTitle: function(aTitle) {
    this.data.value = aTitle;
    if (!this.data.modified)
      this.window.Tabmix.setItem(this.panel, "modified", aTitle != this.data.docTitle || null);
  },

  hidePopup: function() {
    this.panel.hidePopup();
  }
};