Page Ruler Tool
Measure anything on a page in pixels: crosshair with live coordinates, drag-to-measure rectangles with width, height and diagonal.
可在 Android™ 版 Firefox 上使用
扫码在 Android 版 Firefox 中打开此扩展
Measure anything on a page in pixels: crosshair with live coordinates, drag-to-measure rectangles with width, height and diagonal.