diff --git a/src/mjs/constant.js b/src/mjs/constant.js
index 29c5fa57..e1afc08b 100644
--- a/src/mjs/constant.js
+++ b/src/mjs/constant.js
@@ -4,6 +4,9 @@
 
 export const CONTENT_GET = 'getContent';
 export const CONTEXT_MENU = 'contextMenu';
+export const EDIT_HTML = 'editHtml';
+export const EDIT_MD = 'editMarkdown';
+export const EDIT_TXT = 'editPlainText';
 export const EDITOR_CONFIG_GET = 'getEditorConfig';
 export const EDITOR_CONFIG_RES = 'resEditorConfig';
 export const EDITOR_CONFIG_TS = 'editorConfigTimestamp';
@@ -57,7 +60,7 @@ export const MODE_EDIT = 'modeEditText';
 export const MODE_EDIT_EXT = 'modeEditTextFileExtension';
 export const MODE_EDIT_HTML = 'modeEditTextHtml';
 export const MODE_EDIT_MD = 'modeEditTextMarkdown';
-export const MODE_EDIT_TXT = 'modeEditTextPlaintext';
+export const MODE_EDIT_TXT = 'modeEditTextPlainText';
 export const MODE_MATHML = 'modeViewMathML';
 export const MODE_SELECTION = 'modeViewSelection';
 export const MODE_SOURCE = 'modeViewSource';
diff --git a/src/mjs/main.js b/src/mjs/main.js
index 9af41962..e63cf5f5 100644
--- a/src/mjs/main.js
+++ b/src/mjs/main.js
@@ -14,19 +14,19 @@ import {
 } from './common.js';
 import { setIconBadge } from './icon.js';
 import {
-  CONTENT_GET, CONTEXT_MENU, EDITOR_CONFIG_GET, EDITOR_CONFIG_RES,
-  EDITOR_CONFIG_TS, EDITOR_EXEC, EDITOR_FILE_NAME, EDITOR_LABEL, EXT_NAME,
-  FILE_EXT_SELECT, FILE_EXT_SELECT_HTML, FILE_EXT_SELECT_MD,
-  FILE_EXT_SELECT_TXT, HOST, HOST_COMPAT, HOST_CONNECTION, HOST_ERR_NOTIFY,
-  HOST_STATUS, HOST_STATUS_GET, HOST_VERSION, HOST_VERSION_CHECK,
-  HOST_VERSION_LATEST, HOST_VERSION_MIN, ICON, INFO_COLOR, INFO_TEXT,
-  IS_CONNECTABLE, IS_EXECUTABLE, IS_MAC, LOCAL_FILE_VIEW, MENU_ENABLED,
-  MODE_EDIT, MODE_EDIT_EXT, MODE_EDIT_HTML, MODE_EDIT_MD, MODE_EDIT_TXT,
-  MODE_MATHML, MODE_SELECTION, MODE_SOURCE, MODE_SVG, ONLY_EDITABLE,
-  OPTIONS_OPEN, PATH_OPTIONS_PAGE, PROCESS_CHILD, SYNC_AUTO, SYNC_AUTO_URL,
-  TMP_FILES_PB, TMP_FILES_PB_REMOVE, TMP_FILE_CREATE, TMP_FILE_DATA_PORT,
-  TMP_FILE_DATA_REMOVE, TMP_FILE_GET, TMP_FILE_REQ, TMP_FILE_RES, VARS_SET,
-  WARN_COLOR, WARN_TEXT
+  CONTENT_GET, CONTEXT_MENU, EDIT_HTML, EDIT_MD, EDIT_TXT, EDITOR_CONFIG_GET,
+  EDITOR_CONFIG_RES, EDITOR_CONFIG_TS, EDITOR_EXEC, EDITOR_FILE_NAME,
+  EDITOR_LABEL, EXT_NAME, FILE_EXT_SELECT, FILE_EXT_SELECT_HTML,
+  FILE_EXT_SELECT_MD, FILE_EXT_SELECT_TXT, HOST, HOST_COMPAT, HOST_CONNECTION,
+  HOST_ERR_NOTIFY, HOST_STATUS, HOST_STATUS_GET, HOST_VERSION,
+  HOST_VERSION_CHECK, HOST_VERSION_LATEST, HOST_VERSION_MIN, ICON, INFO_COLOR,
+  INFO_TEXT, IS_CONNECTABLE, IS_EXECUTABLE, IS_MAC, LOCAL_FILE_VIEW,
+  MENU_ENABLED, MODE_EDIT, MODE_EDIT_EXT, MODE_EDIT_HTML, MODE_EDIT_MD,
+  MODE_EDIT_TXT, MODE_MATHML, MODE_SELECTION, MODE_SOURCE, MODE_SVG,
+  ONLY_EDITABLE, OPTIONS_OPEN, PATH_OPTIONS_PAGE, PROCESS_CHILD, SYNC_AUTO,
+  SYNC_AUTO_URL, TMP_FILES_PB, TMP_FILES_PB_REMOVE, TMP_FILE_CREATE,
+  TMP_FILE_DATA_PORT, TMP_FILE_DATA_REMOVE, TMP_FILE_GET, TMP_FILE_REQ,
+  TMP_FILE_RES, VARS_SET, WARN_COLOR, WARN_TEXT
 } from './constant.js';
 
 /* api */
@@ -900,15 +900,35 @@ export const handleCmd = async (cmd, tab) => {
   }
   let func;
   switch (cmd) {
+    case EDIT_HTML:
+    case EDIT_MD:
+    case EDIT_TXT:
     case EDITOR_EXEC: {
       if (!tab) {
         tab = await getActiveTab();
       }
       const { id } = tab;
       if (tabList.has(id)) {
-        func = sendMessage(id, {
-          [CONTENT_GET]: { tab }
-        });
+        if (cmd === EDITOR_EXEC) {
+          func = sendMessage(id, {
+            [CONTENT_GET]: { tab }
+          });
+        } else {
+          let menuItemId;
+          if (cmd === EDIT_HTML) {
+            menuItemId = MODE_EDIT_HTML;
+          } else if (cmd === EDIT_MD) {
+            menuItemId = MODE_EDIT_MD;
+          } else {
+            menuItemId = MODE_EDIT_TXT;
+          }
+          const info = {
+            menuItemId
+          };
+          func = sendMessage(id, {
+            [CONTENT_GET]: { info, tab }
+          });
+        }
       }
       break;
     }