Designing web sites, I kept stumbling across the problem that I had to find out the size of certain elements on a page displayed in the browser window. As most of you might know, this is a pretty difficult task. Therefore I was happy when I found a freeware tool for Mac OS X called “Free Ruler” written by Pascal. Unfortunately I couldn’t find a way to keep it on top of the browser window when klicking on that window, so I kept searching and discovered Kevin Freitas‘ Firefox extension “MeasureIt”. This tool does an excellent job. It only has one drawback. You can’t resize an already drawn rectangle. I hope that Kevin will be able implement this feature in a future release. If you need a similar tool for IE on Windows, check out the “Internet Explorer Developer Toolbar” which is still in beta stage. Unfortunately I couldn’t find a way to draw a rectangle like I can do with “MeasureIt”.