ADDED: Visual Debugging mode preference snaplinks.Debug.Rects (default: false), when on visual debugging rects are shown as well as an information panel for debugging pixel issues on various platforms.
CHANGE: Switched to using devicePixelRatio values from ChromeWindow and Window rather than ..screenPixelsPerCSSPixel and layout.css.devPixelsPerPx
Uploaded 2.4.0b2 to debug #35
https://github.com/cpriest/SnapLinksPlus/blob/master/dist/snaplinksplus-2.4.0b2.xpi?raw=true