diff --git a/doc/konqueror/index.docbook b/doc/konqueror/index.docbook
--- a/doc/konqueror/index.docbook
+++ b/doc/konqueror/index.docbook
@@ -2136,6 +2136,11 @@
 <listitem><para>To change the tab icon.</para></listitem>
 </varlistentry>
 
+<varlistentry>
+<term><guimenuitem>Show Hidden Folders</guimenuitem></term>
+<listitem><para>Toggle whether hidden folders (folders with names that start with a dot) should be shown in the treeview.</para></listitem>
+</varlistentry>
+
 <varlistentry>
 <term><guimenuitem>Remove</guimenuitem></term>
 <listitem><para>To remove the tab page from the Sidebar.</para>
diff --git a/sidebar/default_entries/home.desktop b/sidebar/default_entries/home.desktop
--- a/sidebar/default_entries/home.desktop
+++ b/sidebar/default_entries/home.desktop
@@ -3,6 +3,7 @@
 URL=~
 Icon=user-home
 Open=true
+ShowHiddenFolders=false
 X-KDE-TreeModule=Directory
 X-KDE-KonqSidebarModule=konqsidebar_tree
 X-KDE-Weight=10
diff --git a/sidebar/default_entries/root.desktop b/sidebar/default_entries/root.desktop
--- a/sidebar/default_entries/root.desktop
+++ b/sidebar/default_entries/root.desktop
@@ -4,6 +4,7 @@
 Icon=folder-red
 #Icon=folder-orange
 Open=true
+ShowHiddenFolders=false
 X-KDE-TreeModule=Directory
 X-KDE-KonqSidebarModule=konqsidebar_tree
 X-KDE-Weight=11
diff --git a/sidebar/module_manager.h b/sidebar/module_manager.h
--- a/sidebar/module_manager.h
+++ b/sidebar/module_manager.h
@@ -61,6 +61,7 @@
     void setModuleName(const QString &fileName, const QString &moduleName);
     void setModuleUrl(const QString &fileName, const QUrl &url);
     void setModuleIcon(const QString &fileName, const QString &icon);
+    void setShowHiddenFolders(const QString &fileName, const bool &newState);
 
     /// Find a unique filename for a new module, based on a template name
     /// like "dirtree%1.desktop".
diff --git a/sidebar/module_manager.cpp b/sidebar/module_manager.cpp
--- a/sidebar/module_manager.cpp
+++ b/sidebar/module_manager.cpp
@@ -149,6 +149,14 @@
     ksc.sync();
 }
 
+void ModuleManager::setShowHiddenFolders(const QString &fileName, const bool &newState)
+{
+    KConfig desktopFile(m_localPath + fileName, KConfig::SimpleConfig);
+    KConfigGroup ksc(&desktopFile, "Desktop Entry");
+    ksc.writeEntry("ShowHiddenFolders", newState);
+    ksc.sync();
+}
+
 void ModuleManager::removeModule(const QString &fileName)
 {
     // Remove the local file (if it exists)
diff --git a/sidebar/sidebar_widget.h b/sidebar/sidebar_widget.h
--- a/sidebar/sidebar_widget.h
+++ b/sidebar/sidebar_widget.h
@@ -72,7 +72,8 @@
     QString iconName;
     bool configOpen;
     QUrl initURL;
-
+    bool canToggleShowHiddenFolders;
+    bool showHiddenFolders;
 };
 
 class Sidebar_Widget: public QWidget
@@ -114,6 +115,7 @@
     void slotSetName();
     void slotSetURL();
     void slotSetIcon();
+    void slotToggleShowHiddenFolders();
     void slotRemove();
 
     void slotUrlsDropped(const QList<QUrl> &urls);
diff --git a/sidebar/sidebar_widget.cpp b/sidebar/sidebar_widget.cpp
--- a/sidebar/sidebar_widget.cpp
+++ b/sidebar/sidebar_widget.cpp
@@ -333,6 +333,15 @@
     }
 }
 
+void Sidebar_Widget::slotToggleShowHiddenFolders()
+{
+    Q_ASSERT(currentButtonInfo().canToggleShowHiddenFolders);
+    bool newToggleState = !currentButtonInfo().showHiddenFolders;
+    m_moduleManager.setShowHiddenFolders(currentButtonInfo().file, newToggleState);
+    // TODO: update THAT button only.
+    QTimer::singleShot(0, this, SLOT(updateButtons()));
+}
+
 void Sidebar_Widget::slotMultipleViews()
 {
     m_singleWidgetMode = !m_singleWidgetMode;
@@ -407,7 +416,6 @@
             delete button.dock;
         }
         m_buttonBar->removeTab(i);
-
     }
     m_buttons.clear();
 
@@ -530,6 +538,8 @@
         m_buttonBar->appendTab(SmallIcon(icon), lastbtn, name);
         ButtonInfo buttonInfo(config, desktopFileName, cleanupURL(url), lib, name, icon);
         buttonInfo.configOpen = configGroup.readEntry("Open", false);
+        buttonInfo.canToggleShowHiddenFolders = (configGroup.readEntry("X-KDE-KonqSidebarModule", QString()) == "konqsidebar_tree");
+        buttonInfo.showHiddenFolders = configGroup.readEntry("ShowHiddenFolders", false);
         m_buttons.insert(lastbtn, buttonInfo);
         KMultiTabBarTab *tab = m_buttonBar->tab(lastbtn);
         tab->installEventFilter(this);
@@ -563,6 +573,11 @@
                 buttonPopup->addAction(QIcon::fromTheme("edit-rename"), i18n("Set Name..."), this, SLOT(slotSetName())); // Item to open a dialog to change the name of the sidebar item (by Pupeno)
                 buttonPopup->addAction(QIcon::fromTheme("internet-web-browser"), i18n("Set URL..."), this, SLOT(slotSetURL()));
                 buttonPopup->addAction(QIcon::fromTheme("preferences-desktop-icons"), i18n("Set Icon..."), this, SLOT(slotSetIcon()));
+                if (currentButtonInfo().canToggleShowHiddenFolders) {
+                    QAction *toggleShowHiddenFolders = buttonPopup->addAction(i18n("Show Hidden Folders..."), this, SLOT(slotToggleShowHiddenFolders()));
+                    toggleShowHiddenFolders->setCheckable(true);
+                    toggleShowHiddenFolders->setChecked(currentButtonInfo().showHiddenFolders);
+                }
                 buttonPopup->addSeparator();
                 buttonPopup->addAction(QIcon::fromTheme("edit-delete"), i18n("Remove"), this, SLOT(slotRemove()));
                 buttonPopup->addSeparator();
diff --git a/sidebar/tree_module/tree_module.h b/sidebar/tree_module/tree_module.h
--- a/sidebar/tree_module/tree_module.h
+++ b/sidebar/tree_module/tree_module.h
@@ -52,6 +52,7 @@
 
 private slots:
     void slotSelectionChanged(const QItemSelection &selected, const QItemSelection &deselected);
+    void slotUpdateColWidth();
     void slotKDirExpand_setRootIndex();
     void slotKDirExpand_setSelection(const QModelIndex &index);
     void customEvent(QEvent *ev) override;
@@ -61,7 +62,7 @@
     void setSelectionIndex(const QModelIndex &index);
     QUrl getUrlFromIndex(const QModelIndex &index);
     QModelIndex resolveIndex(const QModelIndex &index);
-    const QModelIndex getIndexFromUrl(const QUrl &url);
+    QModelIndex getIndexFromUrl(const QUrl &url) const;
     QUrl cleanupURL(const QUrl &url);
 
     QTreeView *treeView;
diff --git a/sidebar/tree_module/tree_module.cpp b/sidebar/tree_module/tree_module.cpp
--- a/sidebar/tree_module/tree_module.cpp
+++ b/sidebar/tree_module/tree_module.cpp
@@ -21,8 +21,14 @@
 /*
 
 TODO:
+-sidepanel not triggering changes in session properly
+-"Configure sidebar" > "Add new" has no option to actually add anything there
 -places panel does not respond to view location changes 
 -detect icon size for places panel
+-doubleclick on image (to open kuickview) causes sidebar to deselect
+
+-"View mode" to "sidebar" causes crash and ruins session -- cannot undo
+
 
 BUGS:
 -(konq bug) sftp cannot save file being edited, because: "A file named sftp://hostname/path/to/file already exists."
@@ -53,14 +59,15 @@
     m_initURL = cleanupURL(QUrl(configGroup.readPathEntry("URL", QString()))); // because the .desktop file url might be "~"
     treeView = new QTreeView(parent);
     treeView->setHeaderHidden(true);
-    treeView->header()->setStretchLastSection(false);
-    treeView->header()->setSectionResizeMode(QHeaderView::ResizeToContents);
+    treeView->setHorizontalScrollBarPolicy(Qt::ScrollBarAsNeeded);
+    treeView->setTextElideMode(Qt::ElideMiddle);
 
     model = new KDirModel(this);
     sorted_model = new KDirSortFilterProxyModel(this);
     sorted_model->setSortFoldersFirst(true);
     sorted_model->setSourceModel(model); 
     model->dirLister()->setDirOnlyMode(true);
+    model->dirLister()->setShowingDotFiles(configGroup.readEntry("ShowHiddenFolders", false));
 
     model->openUrl(m_initURL, KDirModel::ShowRoot);
 
@@ -70,6 +77,11 @@
         treeView->setColumnHidden(i, true);
     }
 
+    connect(treeView, &QTreeView::expanded,
+            this, &KonqSideBarTreeModule::slotUpdateColWidth);
+    connect(treeView, &QTreeView::collapsed,
+            this, &KonqSideBarTreeModule::slotUpdateColWidth);
+
     model->expandToUrl(m_initURL); // KDirModel is async, we'll just have to wait for slotKDirCompleted()
     connect(model, &KDirModel::expand,
             this, &KonqSideBarTreeModule::slotKDirExpand_setRootIndex);
@@ -167,8 +179,14 @@
     if (index.isValid() && m_lastURL != urlFromIndex) {
         emit openUrlRequest(urlFromIndex);
     }
+    slotUpdateColWidth();
 }
 
+// needed because when there is only one column, QTreeView does not trigger resize
+void KonqSideBarTreeModule::slotUpdateColWidth()
+{
+    treeView->resizeColumnToContents(0);
+}
 
 // needed because KDirModel is async
 void KonqSideBarTreeModule::slotKDirExpand_setRootIndex()
@@ -190,6 +208,7 @@
             this, &KonqSideBarTreeModule::slotKDirExpand_setSelection);
         setSelection(m_lastURL, false);
     }
+    slotUpdateColWidth();
 }
 
 
@@ -217,7 +236,7 @@
     return resolvedUrl;
 }
 
-const QModelIndex KonqSideBarTreeModule::getIndexFromUrl(const QUrl &url)
+QModelIndex KonqSideBarTreeModule::getIndexFromUrl(const QUrl &url) const
 {
     return sorted_model->mapFromSource(model->indexForUrl(url));
 }