An essential extension/sidebar for web developers using Firefox, UrlParams conveniently summarizes all of your URL parameters into a readable and usable sidebar. It show the querystring from the last request to the server. Sure, you can see the same info with LiveHTTPHeaders, but the layout of this extension is a show-stopper!
Pearl Crescent Page Saver is a fantastic extension that will take a screenshot of any page loaded in the browser. If the page you’re trying to capture has scrollbars, the entire page is captured! This extension differs from the others available as it does not require Java to be installed.
Google Safe Browsing is an extension to Firefox that alerts you if a web page that you visit appears to be asking for your personal or financial information under false pretences.
Extended Statusbar is a nice Firefox extension that show all kinds of useful data about the page you are currently downloading. Most importantly is the page weight (in kB) and also shows how many images are being transfered as well as the bandwidth and time to page load.
I absolutly love the JavaScript Console in Firefox and with the release of Firefox 1.5, it got even better. Now the standard JS console displays not only great JavaScript error messages, but it now show you CSS errors! The only problem is that with so much information appearing in the console, it can be difficult to find the errors you are looking for. Enter Console². It is a Firefox extension that adds some great filtering options for the console like showing only JavaScript, CSS or XML errors and filtering the source of errors like on the page you are viewing (content) or errors in the Firefox UI (chrome).
There is now an official del.icio.us firefox extension available directly from the fine people who created the public bookmarking service. The extension provides nice integration of del.icio.us’ features into Firefox.
ietab is a vary neat Firefox Extension that allows you to switch between the IE and Firefox rendering engines right within the Firefox browser. Here is how it works. Once installed, when you browse to a page in Firefox, you will notice a small Firefox icon in the status bar. Click on that icon and the page get’s rendered with IE’s rendering engine and the logo changes to the IE logo. I use this all the time now when I’m developing - it’s a real timesaver!
Link via Instant Badger
Bookmark Tags Firefox Extension is a neat new way to organize your local bookmarks. It operates much like the del.icio.us public bookmarking system, by allowing you to tag your bookmarks with simple words. Traditional bookmarking systems force you to organize your bookmarks into folders with one bookmark per folder. The beauty with this extension is that one bookmark can have many tags freeing you from the traditional folder heirarchy model.
