Use array.from() to conver the nodelist to an array for firefox

packages/block-editor/src/utils/get-editor-region.js

@@ -2,7 +2,7 @@
  * Gets the editor region for a given editor canvas element or
  * returns the passed element if no region is found
  *
- * @param { Object } editor
+ * @param { Object } editor The editor canvas element.
  * @return { Object } The editor region or given editor element
  */
 export default function getEditorRegion( editor ) {
@@ -13,16 +13,15 @@ export default function getEditorRegion( editor ) {
 	// If there are multiple editors, we need to find the iframe that contains our contentRef to make sure
 	// we're focusing the region that contains this editor.
 	const editorCanvas =
-		document
-			.querySelectorAll( 'iframe[name="editor-canvas"]' )
-			.values()
-			.find( ( iframe ) => {
-				// Find the iframe that contains our contentRef
-				const iframeDocument =
-					iframe.contentDocument || iframe.contentWindow.document;
+		Array.from(
+			document.querySelectorAll( 'iframe[name="editor-canvas"]' ).values()
+		).find( ( iframe ) => {
+			// Find the iframe that contains our contentRef
+			const iframeDocument =
+				iframe.contentDocument || iframe.contentWindow.document;
 
-				return iframeDocument === editor.ownerDocument;
-			} ) ?? editor;
+			return iframeDocument === editor.ownerDocument;
+		} ) ?? editor;
 
 	// The region is provivided by the editor, not the block-editor.
 	// We should send focus to the region if one is available to reuse the