This a few feature needed install on your firefox browser.
If you web developer I think this add on feature will help you for finish your jobs
HTML Validator is a Mozilla extension that adds HTML validation inside Firefox and Mozilla. The number of errors of a HTML page is seen on the form of an icon in the status bar when browsing. The details of the errors are seen when looking the HTML source of the page.
The extension is based on Tidy and OpenSP. Both algorithms were originally developed by the Web Consortium W3C. And now extended and improved by a lot of persons. Both algorithms are embedded inside Mozilla/Firefox and makes the validation locally on your machine, without sending HTML to a third party server.
4. Fire FTP
Do you need FTP on your browser and doesn’t want to move another application, you need this attach this extension on your firefox browser. FireFTP is a free, secure, cross-platform FTP client for Mozilla Firefox which provides easy and intuitive access to FTP servers.
This extension will analyzes web pages and tells you why they’re slow based on the rules for high performance web sites. This extension need firebug, so you must install firebug first before using it.
What YSlow gives you:
* Performance report card
* HTTP/HTML summary
* List of components in the page
* Tools including JSLint
This feature will give you nice experiences while browsing in internet
1. AdBlock Plus
Every firefox freak know this extension, yeah this extension will remove all banner that will annoying our seen.
Full-Screen, 3D — PicLens transforms your browser into a visually stunning experience for enjoying online photos and videos. With interactive “3D Wall” lets you effortlessly search and zoom your way around thousands of images and YouTube videos faster and more immersively than ever before.
ThumbStrips is a Firefox extension that creates a filmstrip of thumbnails — ThumbStrip, get it? — so you can see your history, and stop guessing at page names in the history sidebar. You can even share your ThumbStrips! After you install it, a small icon will appear in your browser’s toolbar. Click the icon to view your ThumbStrips at the bottom of the screen.
Sometimes we lazy for reading some article, but we want to collection the article for reading in another times, this extension will give us that feature. We can organized our article on specific folder and read offline.
This feature you will get from scrapbook.
* Save Web page
* Save snippet of Web page
* Save Web site
* Organize the collection in the same way as Bookmarks
* Full text search and quick filtering search of the collection
* Editing of the collected Web page
* Text/HTML edit feature resembling Opera’s Notes
If you’re maniac on social bookmarking this feature must put on your firefox, you can share your link to your facebook, stumbleupon or etc
6. Next Tab
If you’re maniac tab you must test this addon
I think this enough for now, maybe it’s still many feature that will come earlier.