Recently, I noticed that m.facebook.com (redirect to mobile.facebook.com) got really really big.. sort of like a big phone. It used to not do this. I deleted my cookies and it still did this.
Chrome is ok.
Unfortunately, I do not see a way to show pictures.. but if you can imagine..
Chrome (and opera used to do this) gives a border on each side and makes it useable.
Opera today.. fills the whole screen up as if it were a phone. This is cumbersome to use and requires much effort.

Not sure how to fix it. I am using chrome again.
Why do I use m.facebook.com (it uses a fraction of the mb that web.facebook.com uses)

38.0.2220.41 - Opera is up to date
Update stream: Stable
System: Ubuntu 16.04 LTS (x86_64; MATE)