Resize Flash Game or Movie At Any Size With FlashResizer

FlashResizer is a very impressive Firefox add-on for those looking for a resize any flash movie/clip/game/whatever.You can resize flash player window (and also flash game window) at any size by just dragging.

FlashResizer extension adds a early-unnoticeable two-pixels-width vertical green line next to flash objects, which what you'll use to perform the resize, furthermore double-clicking that green line will automatically adjust the flash element to the browser window's inner width/height.
Download FlashResizer at Mozilla add-on site.[via-techtrickz]