Thank you all for these answers.
My goal was not exactly to edit multiple records at once (through Grid Edit or export to Excel). But rather to edit fields from the field list.
What I'm actually doing is to open a lot of field property tabs, modify them 1 by 1, save them individually, close the tab. I wish I could right-click them directly from the list, but Firefox does not seem to support this feature well (opens two context menus!), I use <Ctrl> + left click to open in new tabs instead.
So my problem still lies in a few words: is there any shortcut to save the field properties in a field setting window? Meaning, I do not want to waste time clicking the green "Save" button :)