Few days ago I found a great extension for my favorite internet browser. The Web Developer gives us many useful tools and features:

• managing cache, javascript, colors
• disabling, adding, viewing of cookies
• tools related to CSS on the page (displaying styles, live editing)
• manipulate forms on a page
• outlining page elements (tables, images, divs…)
• finding broken images
• various information about all elements on a page, viewing document size
• resizing window to given resolution
• many others…

I really recommend this amazing tool.