In Opera, when I close a tab, it then shows up in the "closed tabs" list that can be accessed by clicking on the "recycle bin" icon in the tab bar, and I can re-open it. (See this link in Opera's online help to see the feature I'm talking about.)
It used to be all of my tabs showed up in this list. However, after updating to the most recent Opera version (10.63), I noticed that tabs from secure sites (i.e., those with
https:// urls) don't show up in the list; I would close the tab and it would simply disappear.
Most perturbing, I noticed when I was writing this question and testing some things that they've started showing up in the list again.
Am I going nuts, or is there a setting to turn this on/off that I twiddled while poking around trying to fix this and didn't realize I'd twiddled?