Yes you're right
Mousing over doesn't reveal tabs in browser windows.
In that case the only solution I know of for browsers is the multi-tabs browser page. Many browsers offer this as my own does, Firefox.
It displays as thumbnails all the tabs and windows you have open in one tab page. That said, I have just tried my Firefox one and can't find how to get started in it.
That won't work with non-browser applications.