SimilarWeb allows you use the extension interface for both browsing and voting instead of being limited to a web-based directory. Once you have the extension installed, using it is as simple as clicking on the SW icon beside the address bar. You can rearrange the suggested order of sites, submit new sites, and vote a suggested site up or down based on relevance.
The Feed Sidebar is an extension for Firefox that displays the items from your Live Bookmarks in the sidebar. It is intended to be a lightweight extension of the RSS capabilities already included in Firefox, not a completely new feed management system.
View and manage downloads from a tidy statusbar – without the download window getting in the way of your web browsing.
Despite its compact size, Download Statusbar packs in more useful features than the standard download window. The fully customizable interface auto-hides when not in use, allowing full control without interruption.
Firefox: 2.0 – 2.0.0.*