Whenever you need your web design to be pixel perfect a nice simple way to check things out is to to use CTRL+ (Mac: APPLE+) in Firefox to zoom in (use “-” for out) and then use the MeasureIt add-on to count the pixels.

Quick, simple and easier than screen capturing and bringing the cap into PhotoShop to examine.

Ever develop a web site that displays different content based on the visitor’s browser’s language settings? The server side code would look for the accept-language header and then do it’s magic. But how do you test this easily. Introducing Modify Headers for Firefox. Simply setup a new header with these parameters and you can start browsing as if you spoke Spanish (or whatever other language you prefer):

Action: Modify
Name: accept-language
Value: es-mx,es-us,es