A source viewer that enables you to view not only page's HTML source but also style sheets and scripts. It uses Prism syntax highlighter and it can beautify(unminify) the source code.
This firefox extension enables screen capturing support in Firefox for Oritor pages.
Proof of concept for reading articles without login
Override User Agent allows to override the default string of the User-Agent in the toolbar, the changes affect only the current domain.
Zoom in Youtube Videos with OwlZoom
Page Coverage (Selenium IDE) Requires Restart
A plugin for Selenium-IDE to generate page coverage reports highlighting areas of a web page touched by the Selenese test cases / test suites.
Show the page's bookmark counts for Hatena Bookmark. And jump to the detail page. This is *not* official one.
Page Hacker Revived Requires Restart
Adds a toolbar to edit and format the current page
Page Info Forms and Links Requires Restart
Adds forms and links tabs to page info dialog like at Firefox 2.0.
Page Meta Manager Requires Restart
Extension for code analysis page (meta tags) and display the menu to work on them.
Get accurate performance timing for any page with this extension
Page Rank by GoingUp! Requires Restart
Easy, reliable, and unobtrusive viewing of Google page rank in your browser window.
Page Rank Checker Requires Restart
Page Rank Checker: Check Google Page Rank in live mode
A lightweight ruler to measure web page elements.
Quickly and easily capture an image of a web page. Options allow you to control output format (PNG or JPEG), file name and more.
This is a new WebExtensions implementation of Page Saver. It does not contain all of the features of its predecessor.
Page size checker Requires Restart
This add-on will check the page size. If you specify a page size exceeds the warning alert dialog.
Page Source Requires Restart
Page Source places an add-on bar button that open the Page Source qucikly.
Page Update Checker Requires Restart
Tired of clicking the reload button?...
Page validator Requires Restart
Validates a page using the W3C Markup Validation Service.