2.4.7 * Fix fatal error on restoration of tabs from the cache. * Show active and hover marker for tabs at the Mixed theme, to match tab style of Firefox itself. * Use `Highlight` system color to highlight active and hover tabs at the Vertigo and the Mixed themes, on Linux. * Apply background color correclty at the Vertigo theme. * Update `en` locale (by Thomas Bertels, thanks!) * Update `zh_TW` locale (by Bo-Sian Li, thanks!) * Update `de` locale (by sicherist, thanks!)