Only supports width and the "viewport" options don't resize the viewport, they resize the actual window making them redundant.

Has bugs and seems to be an Alpha Test version. Maybe sometime in the future. Deleted.

This only resizes the viewport or window WIDTH, which are both equal. What good is that? I need to resize the viewport HEIGHT.

Useless, customization unable and small width.

not customizeable, ctrl+shift+m is useless for my use case (and if i was going to use built-in features i wouldnt be looking for add-ons)

Not usable on Mac OS, the shortcuts CTRL-Shift-M or CMD-Shift-M don't work.

Feature-Request: analyse CSS media queries in the currently open page and show them as options to select.

Thanks!