diff --git a/docs/CHANGELOG.md b/docs/CHANGELOG.md
index 599322b7..ebfb1a8e 100644
--- a/docs/CHANGELOG.md
+++ b/docs/CHANGELOG.md
@@ -1,5 +1,9 @@
 # Changelog
 
+### 2.20.1
+
+- `Fix` — Fix copy in FireFox [1625](https://github.com/codex-team/editor.js/issues/1625)
+
 ### 2.20.0
 
 - `New` — [Block Tunes API](block-tunes.md) added
diff --git a/src/components/modules/blockEvents.ts b/src/components/modules/blockEvents.ts
index 89cd5077..b1372901 100644
--- a/src/components/modules/blockEvents.ts
+++ b/src/components/modules/blockEvents.ts
@@ -167,7 +167,7 @@ export default class BlockEvents extends Module {
    *
    * @param {ClipboardEvent} event - clipboard event
    */
-  public handleCommandC(event: ClipboardEvent): Promise<void> {
+  public handleCommandC(event: ClipboardEvent): void {
     const { BlockSelection } = this.Editor;
 
     if (!BlockSelection.anyBlockSelected) {
@@ -175,7 +175,7 @@ export default class BlockEvents extends Module {
     }
 
     // Copy Selected Blocks
-    return BlockSelection.copySelectedBlocks(event);
+    BlockSelection.copySelectedBlocks(event);
   }
 
   /**
@@ -183,14 +183,14 @@ export default class BlockEvents extends Module {
    *
    * @param {ClipboardEvent} event - clipboard event
    */
-  public async handleCommandX(event: ClipboardEvent): Promise<void> {
+  public handleCommandX(event: ClipboardEvent): void {
     const { BlockSelection, BlockManager, Caret } = this.Editor;
 
     if (!BlockSelection.anyBlockSelected) {
       return;
     }
 
-    await BlockSelection.copySelectedBlocks(event);
+    BlockSelection.copySelectedBlocks(event);
 
     const selectionPositionIndex = BlockManager.removeSelectedBlocks();
 
diff --git a/src/components/modules/blockSelection.ts b/src/components/modules/blockSelection.ts
index 1c05d239..c35e8d51 100644
--- a/src/components/modules/blockSelection.ts
+++ b/src/components/modules/blockSelection.ts
@@ -285,7 +285,7 @@ export default class BlockSelection extends Module {
    *
    * @returns {Promise<void>}
    */
-  public async copySelectedBlocks(e: ClipboardEvent): Promise<void> {
+  public copySelectedBlocks(e: ClipboardEvent): void {
     /**
      * Prevent default copy
      */
@@ -304,15 +304,22 @@ export default class BlockSelection extends Module {
       fakeClipboard.appendChild(fragment);
     });
 
-    const savedData = await Promise.all(this.selectedBlocks.map((block) => block.save()));
-
     const textPlain = Array.from(fakeClipboard.childNodes).map((node) => node.textContent)
       .join('\n\n');
     const textHTML = fakeClipboard.innerHTML;
 
     e.clipboardData.setData('text/plain', textPlain);
     e.clipboardData.setData('text/html', textHTML);
-    e.clipboardData.setData(this.Editor.Paste.MIME_TYPE, JSON.stringify(savedData));
+
+    Promise
+      .all(this.selectedBlocks.map((block) => block.save()))
+      .then(savedData => {
+        try {
+          e.clipboardData.setData(this.Editor.Paste.MIME_TYPE, JSON.stringify(savedData));
+        } catch (err) {
+          // In Firefox we can't set data in async function
+        }
+      });
   }
 
   /**