diff --git a/src/vs/editor/browser/controller/textAreaInput.ts b/src/vs/editor/browser/controller/textAreaInput.ts
index e2d42baf4c3a1893b4dc3c54dd01383e4ec65e6b..e6567f2f6130b8fe4028862828172f8520e65e42 100644
--- a/src/vs/editor/browser/controller/textAreaInput.ts
+++ b/src/vs/editor/browser/controller/textAreaInput.ts
@@ -297,7 +297,7 @@ export class TextAreaInput extends Disposable {
 
 			// Due to isEdgeOrIE (where the textarea was not cleared initially) and isChrome (the textarea is not updated correctly when composition ends)
 			// we cannot assume the text at the end consists only of the composited text
-			if (browser.isEdge || browser.isChrome) {
+			if (browser.isEdge || browser.isChrome|| browser.isFirefox) {
 				this._textAreaState = TextAreaState.readFromTextArea(this._textArea);
 			}