The CSS Weblog has compiled a list of the top nine must-have (free) Firefox extensions for Web Developers.
My three favorites:
Web Developer – A collection of useful tools for manipulating cookies, style sheets, forms, images, and so forth.
MeasureIt – A very handy tool that, once activated via a button at the bottom of your browser, allows you to click and drag a selection around any item in the browser while it reads you out the dimensions.
ColorZilla – A great eyedropper tool for grabbing the hex values for any color in a page.
Read the full list here.
[via digg]




The Web Developer extension has a “Display Ruler” tool (under “Miscellaneous”) that is actually much better than the MeasureIt extension. After discovering this, I uninstalled MeasureIt.
I think the one you find first because man gets used to anything very quickly.
probably you are right, this way I also think.
Hi
I can only say, that the programm MeasureIT(Kevinfreitas) is a great tool!