If you don't have permission to edit an issue, clicking on a URL (in a URL type field) does nothing.

Steps to reproduce:

1. Create a URL type custom field;
2. Add this field to view/edit issue screens;
3. Insert a value (URL);
4. Access an issue with an account that doesn't have the 'Edit issue' permission and click on the URL.

Expected results:
The URL will open in a new tab.

Actual results:
Nothing happens.

Notes:
You can get the same result if you add this field to the View issue screen but not to the Edit issue screen.