Bad UX - Nothing happen after granting the permissions

[TheFrenchGhosty]

Describe the bug

After installing Predirect, a page will open to make the user grant access to the "bad" platforms URLs, granting this permission works.

The problem is that... nothing happen after that, which is really bad UX.

The URL should say what should be done after that (eg: close the tab and go configure Predirect by clicking on its icon in your addons list), because right now the user has to guess that "everything is okay".

An alternative might by to just have all the permissions by default when installing the addon (if it's possible?) because what happen if you ever decide to add a service? Will the page to grant permission re-open?

To Reproduce
Install Predirect on a fresh browser