Add a hash anchor to pages under the "about:addons" URL to help guide users

[aiktb]

Hello everyone:

I'm a browser extension developer, and I often need to guide users to do some operations in the document, such as guiding users to set shortcuts for the extension. This is easy to do in Chromium, just let the user enter `chrome://extensions/shortcuts` in the address bar.

But there is no anchor or path on the `about:addons` page of Firefox. I can only describe "click a specific button", which seems not humane, so I hope Firefox can support this to facilitate users.

It is worth mentioning that when I navigate to the shortcut management page on the `about:addons` page, I can get the correct page through "back" and "forward".

Actual:
`about:addons`
Expected:
`about:addons#/shortcut`

[Jon]

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