Link Widgets - Firefox Addon - Eases navigation within sequences of pages (e.g. Web comics, forums, or technical specifications such as the HTML 4 Recommendation) by providing toolbar buttons for the first, previous, next, and last page. Also includes buttons to move up a level in the website, and to the top of the website, and a menu of links to further related pages (which can include a table of contents, an index, printable versions of the current page, translated versions, or page authors' contact details, etc.)
Web pages can provide the information about the related pages using the HTML element, or the extension can guess them by scanning the page for key phrases (which only works well on English-language pages at present), or from the address of the current page. The guessing can be configured from the extension's Options panel in the Firefox Extensions Manager.
After installing you should go to View - Toolbars - Customize... (or equivalent) to add the buttons to a toolbar.
This extension is the successor to the Link Toolbar extension.