@jimunderscorep Thanks for your sugestion. Opera 45 is the last version
produced before Debian Jessie was superceded by Debian Stretch, the
next release of Debian. I did not want to install a later version of opera in case Jessie could not support it. In any case being able to access menus seems to me to be fairly standard operations that a browser should be able to do. I am not curently able to update to Stretch, but that is in the
pipeline.

So? If the required dependencies are met, you can install it on jessie and check if it works.
A (debian) release's eol (= end of life) is not when the new release comes out, but when the devs stop supporting it.

With some window managers, sometimes menus can actually be rendered behind the application - making them invisible unless they are longer than the window. Alternatively, (not so much in Linux as they are less common) a third-party pop-up blocker can sometimes think Opera's menus and drop-downs are pop-up ads.

Thanks for your reply. I will follow up on your advice.

With some window managers, sometimes menus can actually be rendered behind the application - making them invisible unless they are longer than the window. Alternatively, (not so much in Linux as they are less common) a third-party pop-up blocker can sometimes think Opera's menus and drop-downs are pop-up ads.

In any case, it is always a good idea in Linux to list your desktop manager (Gnome, KDE, Enlightenment, MATE, etc.) and window manager (if the latter is not the standard window manager for that desktop especially).