Improved login with content blocking extensions

MindMup now works better with content-blocking extensions, importantly pop-up log in should work more resiliently when users include privacy and content blocking extensions in their browsers. In recent years, extensions that block unwanted third-party communication (such as ad blockers or privacy blockers) have become increasingly popular. Unfortunately, they sometimes block genuine third-party communication use cases, such as logging in through Google or Microsoft. We have improved support for pop-up login dialogs even when such extensions are used, so our users will be able to browse Internet more securely and still benefit from single-sign on systems.