Pues no sabía que se podían agregar vistas personalizadas y atajos de teclado para cada una. Para pantallas grandes está muy bien. Otro de mis imprescindibles.

Only % not px

Great beginning! Does what it says it will do. But there's room for improvement! ¶ (0) Make current selections editable. ¶ (1) Display the settings for the current selections with the percentages listed in the same order as the "Add" dialog - i.e. the current selections use (Top, Left) - (Bottom, Right) and the dialog order is Left, Right, Top, Bottom. ¶ (2) When clicking a selection, resize the window on the monitor on which the window is located - I have between 2 to 5 monitors (depending on what task(s) I'm working on) and the resized window ALWAYS jumps to my main monitor!

Well, just a few days ago, Firefox Nightly started to act weird on my machine. One of the problems are web pages getting suddenly too large for my screen (with a scroll bar appearing at the bottom). This add-on fixes at least that problem for me. Many thanks !