Pressing the print button on any PDF in the PDF viewer causes the tab to completely freeze, and reloading causes the entire tab to hang.
Here's a screenshot demonstrating my findings:

I pressed 'Print' with the web inspector open (even if it's not open, the issue occurs)
Closed the web inspector, and the tab was already hung, so I pressed reload.
Reload did nothing, as the progressview has been stuck at the same spot for over a minute.
Expected functionality:
The print button works, and does not hang the entire tab.
Version 0.99.137-beta (WebKit 623.1.8.0.0)
Tahoe (26)