UserAgent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Ubuntu Chromium/51.0.2704.79 Chrome/51.0.2704.79 Safari/537.36

Steps to reproduce the problem:
1.Open browser 
2. Click new tab button (or hover mouse on the bookmark toolbar)
3. 

What is the expected behavior?
New tab being opened. 
(on bookmark toolbar, while hovering mouse small selection rectangle appears)

What went wrong?
Browser freezes for some seconds before opening new tab (or before appearing selection rectangle). Sometimes problem is too difficult to recover so that I need to kill the process. 

Did this work before? N/A 

Chrome version: 51.0.2704.79  Channel: stable
OS Version: Mint 18 4.4.0-21-generic x86_64
Flash Version: Shockwave Flash 11.2 r999

Please note that this only happens to chromium browser (Google chrome - 51.0.2704.106 (64-bit) - works fine)