New tab ui broken on Firefox

### Prerequisites

- [x] I am running the latest version of ComfyUI
- [x] I have searched existing issues to make sure this isn't a duplicate
- [x] I have tested with all custom nodes disabled ([see how](https://docs.comfy.org/troubleshooting/custom-node-issues#step-1%3A-test-with-all-custom-nodes-disabled))

### What happened?

the new tab ui broken on firefox after update to v1.25.9, split to 2 lines.

### Steps to Reproduce

1. no need

### How is this affecting you?

Visual/UI issue only

### ComfyUI Frontend Version

1.25.9

### Browser

Firefox

### Console Errors

```javascript

```

### Logs

```shell

```

### Additional Context

_No response_

┆Issue is synchronized with this [Notion page](https://www.notion.so/Issue-5177-New-tab-ui-broken-on-Firefox-2586d73d365081e39d97e05163ebaf8e) by [Unito](https://www.unito.io)