http://www.adsensedecorator.com/adsense-preview-tool-firefox/

13 extensions for professionals in the Great Web Firebox
Like most web developers or SEO professionals, I use a wide range of tools to do the job. I use a combination of desktop and web applications, some purchased and some are free. Everyone I know has downloaded a copy Free Mozilla Firefox, but few realize that by installing some extensions of the 1,500 free, they can eliminate the need for most other applications they currently use. Here are my 13 favorite extensions for web professionals (in no particular order):
HTML Validator: http://users.skynet.be/mgueury/mozilla/ – Validation of web pages to W3C HTML standards with a simple green check in the corner of the page if the page validates, check if it is not red, and an exclamation point yellow if there are warnings. It also includes a better impression of the source code that allows you to see where errors in the code.
FireFTP: https: / / addons.mozilla.org/firefox/684 / – free, secure and multi-platform FTP client that allows easy and intuitive access to FTP servers. This removes a piece of software for those of you who use a separate program for FTP.
Professor X: https: / / addons.mozilla.org/firefox/2823 / – allows you to view information header without having to view the source code. The page "slides" down and Professor X shows you the contents of the element header, including Meta, Script style and content.
NikkelWHOIS: https: / / addons.mozilla.org/firefox/2646 / – view the WHOIS information for any page by clicking the button at the top right of the browser.
IE Tab: http://ietab.mozdev.org – sick of switching between Internet Explorer and Firefox to test a web page that you develop? With IE Tab you can view Internet Explorer in a Firefox tab!
Firebug: https: / / addons.mozilla.org/firefox/1843 / – Advanced debugger console which allows you to monitor your JavaScript, CSS, HTML and Ajax.
Codetech: https: / / addons.mozilla.org/firefox/1002 / – Web page editor that has the feel of Dreamweaver. An amazing extension for anyone doing web design does not pay a few hundred dollars for Dreamweaver.
Server Switcher: https: / / addons.mozilla.org/firefox/2409 / – Easily switch between sites on your development and live servers by clicking on the icon of the server switch.
SEO for Firefox: http://tools.seobook.com/firefox/seo-for-firefox.html – Pulls useful market research data right into Google and the search results Yahoo! s, including Google PR, age, links, Alexa rank, WHOIS and more. He also added some links to the top of search pages, including Google Trends, Google Traffic Estimator, and the Opening View Bid tool.
Yet Another Window Resizer: https: / / addons.mozilla.org/firefox/2498 / – allows you to resize the browser window on the screen default resolutions.
AdSense: https: / / addons.mozilla.org/firefox/2132 / – see Google AdSense ads that appear on this page. This is extremely useful if you plan to put AdSense on a page and do not want to go through the hassle of signing up for an account and put the ads up just to see what type of ads will be displayed.
Screenshot: https: / / addons.mozilla.org/firefox/1146 / – Takes a screenshot Web page and saves an image file. This saves a ton of time compared to the method I used to use – Take a screenshot and open Adobe Photoshop to crop the image.
Server Spy: https: / / addons.mozilla.org/firefox/2036 / – indicates what type HTTP server – Apache, IIS, etc runs on the visited site on the lower right side of the browser.
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Google Adsense Tips & Tools: Adsense Preview (Firefox Add-on)