When on a slow mobile connection (30+ second page load time) the page appears to finish loading but the load bar still has a small amount to go. If there are inbox notifications the temptation is to try to open the inbox.
Clicking on the inbox while the page is still loading does nothing [that’s fine; its still loading] however having done so even after the page fully loads the inbox remains disabled until the page is completely reloaded (so annother 30+ seconds). On the slow connection this can be infuriating.
Test System:
Samsung Galaxy S3 - Android
Standard Browser
I expect this happens on all connections but the window of vulnerability is tiny on fast connections