I’d like to be able to reopen every tab I accidentally closed, not just 15. So even if something goes wrong - I don’t lose anything. Please let me set the number of tabs kept in history to 200 or something, so ctrl+shift+T can save them even when no-one else can.

If you'd like an explanation why I need so many tabs, here it is: https://forums.opera.com/topic/70127/add-more-settings-for-tab-appearance-and-menu-actions