UserAgent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_10_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/49.0.2623.91 YaBrowser/16.4.0.8198 (beta) Safari/537.36

Example URL:
any non-openable by browser download (.torrent-file, for instance)

Steps to reproduce the problem:
1. Set up the browser as a program to open .torrent files in OS
2. download .torrent file
3. choose "Always open..."
4. download again

What is the expected behavior?
Not sure, perhaps stop after couple of cycles, or check that the address is local filesystem.

What went wrong?
Browser in cycle downloads the file, producing inifinite amount of copies on the disk, until closed.

Did this work before? N/A 

Chrome version: 49.0.2623.91  Channel: stable
OS Version: 
Flash Version: Shockwave Flash 21.0 r0

This happens because after the file is downloaded, it is auto-opened by the browser (we told the OS to do so), and since the browser does not know how to handle this type of files, it just downloads it, and auto-opens and downloads and auto-opens....