Missing tooltip, fixes #324

app/src/components/Controls/TopBar.js

@@ -312,6 +312,12 @@ const TopBar = (props) =>
 					</Typography>
 					<div className={classes.grow} />
 					<div className={classes.sectionDesktop}>
+						<Tooltip 
+							title={intl.formatMessage({
+								id             : 'label.moreActions',
+								defaultMessage : 'More actions'
+							})}
+						>
 							<IconButton
 								aria-owns={
 									isMenuOpen &&
@@ -324,6 +330,7 @@ const TopBar = (props) =>
 							>
 								<ExtensionIcon />
 							</IconButton>
+						</Tooltip>
 						{ fullscreenEnabled &&
 							<Tooltip title={fullscreenTooltip}>
 								<IconButton