diff --git a/html/settings-pane.html b/html/settings-pane.html
index 9435c0a..f5b9a71 100644
--- a/html/settings-pane.html
+++ b/html/settings-pane.html
@@ -57,6 +57,7 @@
    </table>
 </td></tr>
 <tr><td><input type="checkbox" name="enableOFCHotkey" /></td>      <td>Enable Orbital Friendship Cannon Hotkeys: "-" / "_" and numpad"-"</td></tr>
+<tr><td><input type="checkbox" name="isPreventAlts" /></td>        <td>Prevent Alt-# from changing tabs during a battle</td></tr>
 <tr><td><input type="checkbox" name="enableScrollHotkey" /></td>   <td>Enable Page Up/Down key on scrollable panes</td></tr>
 <tr><td><input type="checkbox" name="isDisableForgeHotKeys" /></td>    <td>Disable hotkeys in the Forge (<span style="color: red;">Strongly recommended if using equipment tags</span>)</td></tr>
 <tr><td><input type="checkbox" name="enableShrineKeyPatch" /></td> <td>Patch to enable Space key in the Shrine (Chrome only)</td></tr>
diff --git a/hvstat.user.js b/hvstat.user.js
index c3ea850..056f320 100644
--- a/hvstat.user.js
+++ b/hvstat.user.js
@@ -643,6 +643,7 @@ hvStat.storage.initialValue = {
        isEnableSkillHotkey: false,
        reverseSkillHotkeyTraversalOrder: false,
        enableOFCHotkey: false,
+       isPreventAlts: false,
        enableScrollHotkey: false,
        isDisableForgeHotKeys: false,
        enableShrineKeyPatch: false,
@@ -1381,6 +1382,11 @@ hvStat.keyboard = {
                    }
                }
            }
+           if (hvStat.settings.isPreventAlts && event.altKey
+                   && ((KeyboardEvent.DOM_VK_0<=event.keyCode && event.keyCode<=KeyboardEvent.DOM_VK_9)
+                       || (KeyboardEvent.DOM_VK_NUMPAD0<=event.keyCode && event.keyCode<=KeyboardEvent.DOM_VK_NUMPAD9))) {
+               event.preventDefault();
+           }
        }
    },
 };
@@ -5568,6 +5574,7 @@ function initSettingsPane() {
    if (hvStat.settings.isEnableSkillHotkey) $("input[name=isEnableSkillHotkey]").attr("checked", "checked");
    if (hvStat.settings.reverseSkillHotkeyTraversalOrder) $("input[name=reverseSkillHotkeyTraversalOrder]").attr("checked", "checked");
    if (hvStat.settings.enableOFCHotkey) $("input[name=enableOFCHotkey]").attr("checked", "checked");
+   if (hvStat.settings.isPreventAlts) $("input[name=isPreventAlts]").attr("checked", "checked");
    if (hvStat.settings.enableScrollHotkey) $("input[name=enableScrollHotkey]").attr("checked", "checked");
    if (hvStat.settings.isDisableForgeHotKeys) $("input[name=isDisableForgeHotKeys]").attr("checked", "checked");
    if (hvStat.settings.enableShrineKeyPatch) $("input[name=enableShrineKeyPatch]").attr("checked", "checked");
@@ -5753,6 +5760,7 @@ function initSettingsPane() {
    $("input[name=isEnableSkillHotkey]").click(saveSettings);
    $("input[name=reverseSkillHotkeyTraversalOrder]").click(saveSettings);
    $("input[name=enableOFCHotkey]").click(saveSettings);
+   $("input[name=isPreventAlts]").click(saveSettings);
    $("input[name=enableScrollHotkey]").click(saveSettings);
    $("input[name=isDisableForgeHotKeys]").click(saveSettings);
    $("input[name=enableShrineKeyPatch]").click(saveSettings);
@@ -5898,6 +5906,7 @@ function saveSettings() {
    hvStat.settings.isEnableSkillHotkey = $("input[name=isEnableSkillHotkey]").get(0).checked;
    hvStat.settings.reverseSkillHotkeyTraversalOrder = $("input[name=reverseSkillHotkeyTraversalOrder]").get(0).checked;
    hvStat.settings.enableOFCHotkey = $("input[name=enableOFCHotkey]").get(0).checked;
+   hvStat.settings.isPreventAlts = $("input[name=isPreventAlts]").get(0).checked;
    hvStat.settings.enableScrollHotkey = $("input[name=enableScrollHotkey]").get(0).checked;
    hvStat.settings.isDisableForgeHotKeys = $("input[name=isDisableForgeHotKeys]").get(0).checked;
    hvStat.settings.enableShrineKeyPatch = $("input[name=enableShrineKeyPatch]").get(0).checked;