Hey, i think i found the culprit.

I check my opera settings, the battery saver is enabled.

I disabled it and seems its working fine for the whole day now. No more OOM error on Facebook tab.

@lionclaw hi, i just did some search. there is a similar thread and it works.

https://forums.opera.com/topic/37378/solved-run-out-of-memory/29

Hey, i think i found the culprit.

I check my opera settings, the battery saver is enabled.

I disabled it and seems its working fine for the whole day now. No more OOM error on Facebook tab.

Hi,

Are you able to find any solution for this?

Based on your description, it is what exactly happen to me as well.
The OOM error occur only on Facebook tab, especially if i open/active on other tab.

This happen after i upgrade my OS and clean format my Desktop. OOM never happen to me before OS formating, even if i open 42 tabs.

Current spec:
OS: Windows 10 Pro (Build 18362)
RAM: 16GB
Addson: None. (Only Opera builtin like Ads block)