An excellent hand picked collection of Firefox add-ons for webmasters, web designers, web developers, SEOs, internet marketers, and SXOs.
The User Agent Switcher extension adds a menu and a toolbar button to switch the user agent of a browser.
The Web Developer extension adds various web developer tools to the browser.
View HTTP headers of a page and while browsing.
Draw a ruler across any webpage to check the width, height, or alignment of page elements in pixels.
Attempting to reduce both Browser and Flash RAM Memory usage. Memory Fox will promote the increase of available RAM memories for other application processes. Hopefully, fostering any attempts of Memory Recovery and Retention.
HTML Validator is a Mozilla extension that adds HTML validation inside Firefox and Mozilla. The number of errors of a HTML page is seen on the form of an icon
For Firefox 23+, you need 0.958 (under review)
Checks for compliance with the contrast levels, brightness and shine in the color combination of foreground and background of textual content based on the requirements of WCAG 1 and WCAG 2.
The toolbar enables developers to examine WAI-ARIA live regions roles and properties, examine data tables, and determine if the colour contrast is sufficient.
Operator leverages microformats and other semantic data that are already available on many web pages to provide new ways to interact with web services.
SEO Workers Analysis Tool extension allows you to perform a basic analysis of the page in your browser with a single click. The results from the SEO Workers Analysis Tool are structured into the following useful groups:
General status, meta tags li...
Checks your document for semantic elements and highlights them.
Displays a status bar icon to indicate presence of Semantic Web (RDF) data in the web page. Click the icon to explore this information in more detail...
A tool for generating structured descriptor documents for HTTP accessible resources. HTML+RDFa based Linked Data is the default Descriptor Document format. Other formats are available via page hosted links or content negotiation.
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