re-sizing
One of the issues I've found with a 3440x1440 curved monitor is that some websites display based on your monitor resolution, rather than the size of the actual window. Presumably they aren't aware that not everyone runs everything full screen?
This had the unfortunate effect of some crucial menu options being waaaaaaaaaaaaay over to the right, with a small section on the left displaying the actual content. When I was running this in a window I initially thought the menu was simply missing. That's a lot of scrolling, and then you can't see what effect an option has had until you scroll back left again - unless you like viewing your websites as if your eyes were 3ft apart :)