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.
Firefox addons
Firefox Add-ons for WordPress
If your browsers is called Firefox and your blog engine Wordprss, this is the extension that can helps you working with WordPress by providing useful help and tools. The extension eases the fast and simple access to develop-relevant pages of the WordPress Codex. So you always have all the necessary help at your fingertips. It’s also possible to search after strings of text that is currently marked. Furthermore it’s possible to easily switch to WordPress backend of current site. More than that, a small Icon indicates wether the currently displayed website makes use of WordPress.
Update for Firefox 3.0.3
Two very fast update for Firefox. Now available for update Firefox 3.0.3 with the fixed problem where users were unable to retrieve saved passwords or save new passwords. But for Firefox 3.0.2 there are a lot of fixed problems like security issues, stability issues, layout problem with certain web pages. A full list you can find in the 3.0.2 release notes.
You can download Firefox 3.0.3 from here or if you have already installed any previews version you can simply update in two steps. Going to Help menu and after Apply Downloaded Update Now:
Video playlist in Firefox sidebar
YouPlayer is "must-have" Firefox extension for all video-site fans. YouPlayer is an extension for Firefox, once is installed it will appear in a sidebar inside Firefox, which makes possible to add (dragging and drop) videos in the playlist. YouPlayer support most popullar video platforms sites like Google Video, MetaCafe, MySpace and YouTube.
Your Firefox Tab like Sidebar
The tab sidebar extension, if you haven’t heard of it already, provides a sidebar in the browser that can act as a replacement to the main tab bar, complete with always visible preview thumbnails and in tab navigation buttons.
Firefox Bookmark Previews
Along with an album view (like cover flow) and a thumbnail view (with drag and drop), this extension also adds previews to the tooltips in the bookmarks sidebar. Just hover over a bookmark in the sidebar to see the previews.
In Firefox 3 you can access the two new views by opening the Library. To get there go to Bookmarks>Organize Bookmarks. From there you can toggle the view with the 3 buttons to the left of the search box or from the View menu.
3 neccesary Firefox Add-ons
Feed Sidebar
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.