Can't access navigation when page is still loading

I noticed while a site is still loading, interacting with the navigation isn't possible.

To Reproduce:

1. Type in a slow loading URL
2. While the site is still loading try to access tabs

I would like to interact with the navigation while a site is still loading.

This is especially useful in the following circumstances:

• Site may refuse to load
• Network issues
• Performance issues
• User would like to visit a different site while the site is loading

1.3.20 (1) (WebKit 8619.1.26.30.5)

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