ResizeMe
This extension adds a toolbar that allows you to resize the Safari window to six different sizes, including full screen. You can also right-click to resize the window. Read more
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Firebug Lite for Safari
Firebug is a tool to help you develop and debug HTML, Javascript and CSS. Click on the Firebug Lite for Safari button while you browse, and instantly edit, debug and monitor the web page you are viewing. Read more
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MeasureIt
By Frayd Media
MeasureIt lets you draw a ruler on any web page to check the width, height, or alignment of page elements in pixels. Read more
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View Background Image
By Matt Sephton
Provides a contextual menu item allowing you to view – in a new tab – the background image of any element. Read more
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Alexa Traffic Stats
This extension displays traffic statistics for the current page as determined by Alexa. Information — like page views, bounce rate, and average time on site — appears in the lower-right corner of the web page. Read more
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Zend Debugger Toolbar
This is an alpha version of a toolbar for debugging PHP projects with the Zend Debugger (included with Zend Studio or Zend Server). Read more
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GetIncDec
This small Safari extension helps developers to easily change numeric values in URLs by increasing or decreasing the last numeric value. Read more
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BetterSource
By Awarepixel
BetterSource shows the document source of a web page in a new tab with line numbers and color syntax highlighting. Read more
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Lorem Ipsum
By Pavel Kunc
Lorem Ipsum adds context menus that allow you to easily generate Lorem Ipsum text and insert it into text fields and text area form elements. Read more
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Safari Validator
Safari Validator is a Safari extension which allows you to validate your website for (x)html compliance. The actual validation is done by Tidy and the W3C validator. Read more
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BuiltWith
By BuiltWith
BuiltWith is a website profiler tool. Upon looking up a page, BuiltWith returns all the technologies it can find on the page. Its purpose is to help developers, researchers, and designers discover what technologies web p... Read more
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Coda Notes
By Panic Inc
Coda Notes gives you a full suite of tools to visually communicate web ideas in Safari. Use a pen tool to scribble notes, highlight areas, erase mistakes, tack on sticky notes, even change editable text directly on a we... Read more
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Validator
The Validator extension checks the validity of your (X)HTML code, CSS styles, and RSS feed using W3C Validators and optionally displays the count of errors and warnings found in the badge. Read more
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Unicorn
By 0coder
This extension examines the webpage you’re on using W3C Unicorn, the W3C’s validator. Click on the toolbar button to see the results of HTML and CSS validators. Read more
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VSS
By Soner Eker
A tool designed for web developers, VSS lets you view the current site's style sheets. Read more
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