Ghm. Thanks for sharing info. Maybe this feature does not work on linux at all. It is very little documentation about it. Would be interesting to hear comments from Opera developers themselves.

Hi,

I enabled the hibernation flag in Opera on my Ubuntu machine. Description I found in one f the forums is:

#tab-hibernation – If a background tab is inactive (does not load anything including XHRs, plays any media, plug-in is not streaming any data, or a script is not changing page’s title/favicon) for 40 seconds its process gets suspended and swapped out (causing process memory usage drops significantly) ...

I am waiting for hours already but non of the tabs seems to be hibernated (process count does not decrease, memory usage stays the same). Does anybody succeeded in using this feature? Or maybe I am checking it wrong ... I don't know.

My system is:
Version: 30.0.1835.125 - Opera is up to date
Update stream: Stable
System: Ubuntu 15.04 (x86_64; Unity)