es ist leider nicht möglich, die Lesezeichen-Symbolleiste nach rechts zu ver schieben, auch die Schaltfläche "Sidebar" fehlt

Hello Maybe, take a look at Customize Firefox controls, buttons and toolbars https://support.mozilla.org/en-US/kb/customize-firefox-controls-buttons-and-toolbars Use the sidebar to access tools and vertical tabs https://support.mozilla.org/en-US/kb/use-sidebar-access-tools-and-vertical-tabs An subject https://connect.mozilla.org/t5/discussions/sidebar-and-vertical-tabs-launch-in-release-136/m-p/94547/highlight/true#M36887 For information purposes 1 - Go to Configuration Editor for Firefox https://support.mozilla.org/en-US/kb/about-config-editor-firefox 2 - Enter a search term '''sidebar.revamp'''