Although most/all of jenkins is usable by users using a screenreaders like me, it seems that the editor is not.
I mean at least some places where I can enter multiline data, and that is for example editor of configuration files when using config file plugin, editor where you can enter shell scripts to execute for a build step, or anything that you can enter when your markup formatter is switched from plain to any other.
Accessibility events are not reported when moving through the editor, so I do not know anything when I arrow through the text, there is just no feedback as it goes for normal html fields, so I cannot review what I type and read anything from the field, by any means.