First a little warning: install any addon at your own risk, and if your browser slows down, freezes or crashes, try disabling your addons one by one and see if that helps!

I personally have no problems with any of these addons  but your system configuration surely is different!

My Must Have addons:

1. Roboform $ If you use Roboform, I don’t need to tell you anything more on this. If you don’t use it you don’t know what you are missing out on!

The main feature of Roboform is that it can manage different user names and passwords at hundreds (or thousands) of sites.  Another great feature of Roboform is that you can use it to save and fill forms.

You and download it from here and try the limited free version, but to be really useful you need to upgrade to the paid version. If you like you can read more and get it from the publishers website. It’s well worth the price.

2. DownloadHelper: Download and video addons available for Firefox but this is what I have found to be the best. It manages to grab just about any video from any web site, even those that I had problems with when hidden behind “controller.swf” or similar setups.

3. ScribeFire: addon I use for posting to my Wordpress Blogs. ScribeFire is a full-featured blog editor that integrates with your browser and lets you easily post to your blog. You can drag and drop formatted text from pages you are browsing, take notes, upload images, and post to multiple blogs.