In the last version(s) of Opera it began opening all my Opera windows when I start Opera from my taskbar (after I started my computer). I use Win 10. My Opera has auto update in settings, so I don't know exactly the version opera started doing this.
Previously opera started just the last "active" windows I was using (open on my screen) when I shutdown my computer.
To save energy and for other reasons I shutdown my computer when I don't use it (up to many times a day). I work in 30-50 Opera windows with several hundreds of tabs. Please don't start argue the way I use Opera or my computer!!
Previously my computer and Opera started quickly, but the way Opera works now it's very time consuming and so memory consuming that my computer become slow and useless, when Opera open All my windows and refresh hundreds of tabs each time I start my computer and Opera.
I can't find ant way to turn this of in opera setting. The only way I found as quick fix is for now, is as quickly as possible use the show my workspace, function in taskbar.
I se that Vivaldi browser is working the same way as opera do now. Chrome doesn't.
I used Opera as my main browser since it came on the market, but if there's no way to fix it in settings or Opera fix it, I'm forced to switch to Chrome.