One of my favorite apps is Screen Calipers, but I noticed recently when downloading the new trial that the price went up over 30% (now $29.90) and they crippled the trial app further so you couldn’t make vertical pixel measurements. I guess this means there weren’t enough paid registrations? Here’s an alternative to measure pixel space using a Firefox extension for those who would like to have similar functionality for free: measure it.

Once the extension is installed it sits in the lower left of your Firefox status bar and can be invoked by clicking on the graph. Then draw with the sights a box around what you want to measure on screen. A box with the height and width in pixels will appear (shown in green above).