Doesn't redirect open tabs with *.localhost urls to public gateway

[RubenKelevra]

Describe the bug
If there's an open tab, with an URL like http://cluster.ipfs.io.ipns.localhost/ and refreshed while the local gateway is unavailable (detected by the plugin) there would be just an error page showing "err connection refused".

When URLs like this are open in a new tab, the same thing occurs.

To Reproduce
Steps to reproduce the behavior:

1. Disable local gateway
2. Click on a link like this
3. See error "ERR_CONNECTION_REFUSED"

Expected behavior
The plugin will recognize the IPNS URL and the status of the local gateway and rewrite the URL to load it from a public gateway instead.

Screenshots

Desktop (please complete the following information):

• OS: Linux
• Browser: Brave
• Version: 1.9.80 Chromium: 81.0.4044.138 (Official Build)

[lidel]

Thank you for filling this. I believe this is a duplicate of #806, so closing this one.

(if we had IPFS-aware error page, user would be able to recover from this. we should not redirect to public HTTP server, unless user explicitly chose that)