When tabbing through the app, the Footer comes first

**Steps to reproduce:**

```
Navigate the app using the "tab" key.
```

**Expected behavior:**

```
The first focusable item should be the MenuButtons.
```

**Actual behavior:**

```
The first focusable item is the footer.
```

This doesn't apply to the home page, just the main profiler page.

┆Issue is synchronized with this [Jira Task](https://mozilla-hub.atlassian.net/browse/FP-118)