diff --git a/packages/ckeditor5-ui/src/toolbar/block/blocktoolbar.js b/packages/ckeditor5-ui/src/toolbar/block/blocktoolbar.js
index 19996279de1..f69aa086c5b 100644
--- a/packages/ckeditor5-ui/src/toolbar/block/blocktoolbar.js
+++ b/packages/ckeditor5-ui/src/toolbar/block/blocktoolbar.js
@@ -25,6 +25,7 @@ import normalizeToolbarConfig from '../normalizetoolbarconfig';
 import ResizeObserver from '@ckeditor/ckeditor5-utils/src/dom/resizeobserver';
 
 import toUnit from '@ckeditor/ckeditor5-utils/src/dom/tounit';
+import env from '@ckeditor/ckeditor5-utils/src/env';
 
 const toPx = toUnit( 'px' );
 
@@ -280,6 +281,7 @@ export default class BlockToolbar extends Plugin {
 		const editor = this.editor;
 		const t = editor.t;
 		const buttonView = new BlockButtonView( editor.locale );
+		const bind = buttonView.bindTemplate;
 
 		buttonView.set( {
 			label: t( 'Edit block' ),
@@ -287,6 +289,23 @@ export default class BlockToolbar extends Plugin {
 			withText: false
 		} );
 
+		// Note that this piece over here overrides the default mousedown logic in ButtonView
+		// to make it work with BlockToolbar. See the implementation of the ButtonView class to learn more.
+		buttonView.extendTemplate( {
+			on: {
+				mousedown: bind.to( evt => {
+					// On Safari we have to force the focus on a button on click as it's the only browser
+					// that doesn't do that automatically. See #12115.
+					if ( env.isSafari && this.panelView.isVisible ) {
+						this.toolbarView.focus();
+					}
+
+					// Workaround to #12184, see https://github.com/ckeditor/ckeditor5/issues/12184#issuecomment-1199147964.
+					evt.preventDefault();
+				} )
+			}
+		} );
+
 		// Bind the panelView observable properties to the buttonView.
 		buttonView.bind( 'isOn' ).to( this.panelView, 'isVisible' );
 		buttonView.bind( 'tooltip' ).to( this.panelView, 'isVisible', isVisible => !isVisible );
diff --git a/packages/ckeditor5-ui/tests/toolbar/block/blocktoolbar.js b/packages/ckeditor5-ui/tests/toolbar/block/blocktoolbar.js
index 77d7896100a..8a464d1247b 100644
--- a/packages/ckeditor5-ui/tests/toolbar/block/blocktoolbar.js
+++ b/packages/ckeditor5-ui/tests/toolbar/block/blocktoolbar.js
@@ -28,6 +28,7 @@ import { keyCodes } from '@ckeditor/ckeditor5-utils/src/keyboard';
 import testUtils from '@ckeditor/ckeditor5-core/tests/_utils/utils';
 
 import Rect from '@ckeditor/ckeditor5-utils/src/dom/rect';
+import env from '@ckeditor/ckeditor5-utils/src/env';
 
 describe( 'BlockToolbar', () => {
 	let editor, element, blockToolbar;
@@ -328,6 +329,50 @@ describe( 'BlockToolbar', () => {
 				const blockToolbar = editor.plugins.get( BlockToolbar );
 				expect( blockToolbar.buttonView.isVisible ).to.be.false;
 			} );
+
+			describe( 'mousedown event', () => {
+				// https://github.com/ckeditor/ckeditor5/issues/12184
+				it( 'should call preventDefault to avoid stealing the focus', () => {
+					const ret = blockToolbar.buttonView.element.dispatchEvent( new Event( 'mousedown', { cancelable: true } ) );
+
+					expect( ret ).to.false;
+				} );
+
+				// https://github.com/ckeditor/ckeditor5/issues/12115
+				describe( 'in Safari', () => {
+					let view, stub, spy;
+
+					beforeEach( () => {
+						stub = testUtils.sinon.stub( env, 'isSafari' ).value( true );
+						view = blockToolbar.buttonView;
+						spy = sinon.spy( blockToolbar.toolbarView, 'focus' );
+					} );
+
+					afterEach( () => {
+						stub.resetBehavior();
+					} );
+
+					it( 'should focus the toolbar when it shows up', () => {
+						blockToolbar.panelView.isVisible = true;
+						view.element.dispatchEvent( new Event( 'mousedown', { cancelable: true } ) );
+
+						expect( spy.callCount ).to.equal( 1 );
+					} );
+
+					it( 'should not focus the toolbar when it hides', () => {
+						blockToolbar.panelView.isVisible = false;
+						view.element.dispatchEvent( new Event( 'mousedown', { cancelable: true } ) );
+
+						expect( spy.callCount ).to.equal( 0 );
+					} );
+
+					it( 'should also preventDefault the event', () => {
+						const ret = view.element.dispatchEvent( new Event( 'mousedown', { cancelable: true } ) );
+
+						expect( ret ).to.false;
+					} );
+				} );
+			} );
 		} );
 	} );