Help: Icon size - lllusion3418/webext_tab_number GitHub Wiki

This only refers to the size the text canvas is rendered at, not the actual physical size of the icon in the toolbar (which this extension has no control over).

The size is specified in CSS pixels which differ (in general) from actual display-pixels.

According to the documentation, the size in display-pixels is supposed to be 16 * window.devicePixelRatio. On most traditional displays this seems to correspond to 16 CSS pixels (see this) but in practice I think you can, in fact, tell the difference between 16px and 32px. This advice is also meant for static raster graphics images.