JavaScript Bookmarklets for Accessibility Testing
deCSS3
A bookmarklet for testing your graceful degradation.
Soma FontFriend
a bookmarklet for typographically obsessed web designers. It enables rapid checking of fonts and font styles directly in the browser without editing code and refreshing pages. 2.0鈥檚 killer feature is instant drag-and-drop font previewing right in the browser (Firefox 3.6+ only), in any document you鈥檙e currently viewing.
CSS Prism
Enter the URL of any CSS file to view and modify its color spectrum