Window Resizer is an Opera addon that let you easily re-size and re-position current window to your desired values.
Simply open toolbar popup UI and click on the desired layout set (size & position). Once you click a layout, the window will be positioned and resized to the chosen layout. There are 20 predefined layouts available to choose from in toolbar popup.
If you need a custom layout, please click on the - Add a new layout - button at top left corner in popup UI. A new tab will be open with custom design layout UI. Simply drag your desired size within the orange area, then click on the save button to store the custom layout. The new layout will be added to the popup UI.
Note 1: icons within toolbar popup UI are draggable and the new order will be auto-saved to the memory.
Note 2: in order to report bugs, please fill the bug report form in the addon homepage (http://mybrowseraddon.com/window-resizer.html).