[Bug]: [Firefox] The Recovery Phrase back up pop up overlaps with the scroll bar and other pop ups

### Describe the bug

Only on Firefox, if there is no back up for the Secret Recovery Phrase during creation of the MM account, the "back up" pop up overlaps with the "say hello to bitcoin" section and also with the scroll bar.

**Expected result:**
There shouldn't be any overlap.

**Actual result:**
The "secret phrase back up" pop up overlaps with the scroll bar and other pop ups.

**Environment:**

Device: MacBook Pro M4 ; macOS Tahoe 26.2
Firefox version: 147.0.2
MM v13.19.0

### Expected behavior

_No response_

### Screenshots/Recordings

### Steps to reproduce

- open MM on Firefox
- create an account without back up for the Secret Recovery Phrase during the creation of the MM account
- connect HW
- switch to the regular account
- notice the overlap

### Error messages or log output

```shell

```

### Where was this bug found?

Internal release testing

### Version

13.19.0

### Build type

None

### Browser

Firefox

### Operating system

MacOS

### Hardware wallet

_No response_

### Additional context

_No response_

### Severity

sev3

Start by reproducing the issue in Firefox with the account-creation and hardware-wallet steps described, then trace the Secret Recovery Phrase backup popup and the adjacent "say hello to bitcoin" popup. Done means the backup popup no longer overlaps the scrollbar or other popups in Firefox on macOS.

Written by the indexing model from the issue text.