Useful Firefox Addons

Here I would like to mention some of the Addons to Firefox that I find very useful.
1. Many of the people would like to restore their browser session once they boot their personal computer. So that they need not open each and every tab once they start their browser. There are session restoring features in Firefox but they are not upto the mark. So the best session restoring addon according to me is Tab Mix Plus and it can be found at the Tab Mix Plus
2. For those who are into web development there are two addons that I wud like to suggest. The first and the most notable addon being firebug. This addon is available at the Firebug
This addon has a long list of features. But I would like to point out my favorite features. First being the inspect element feature that will enable you to see the html source of any element that you want to locate. For this you need to right click on the element and select the Inspect Element option. Now many people want to look at the contents of the response that has come back and also check whether the request made is proper or not. For this you need to select the Net tab of firebug and then inspect the contents of request and response. One can also view the contents of the XHRs that are being made. Viewing the contents of XHR is a pretty nifty feature of Firebug.
The second addon that is not very popular being Web Developer. This is at the Web Developer. The feature of this addon which is not present as it is in Fire Bug being the View Layout option. This option enables one to view the layout of the page properly. Fire Bug also has this option but not as sophisticated as Web Developer.
3. The third addon being the stumble upon addon which is my favorite addon. Now this addon not only allows you to stumble but also record any pages that you want to record. This is much more useful for me because I visit certain pages and I dont want to loose their pointer at any cost. So as soon as I find any page that needs to be stored I wud mark it as thumbs up. Then later in time I can retrieve the list of pages that I liked and I can easily search for the wanted pages. This addon however is present in the stumble upon home page from where one can obtain and install stumble upon add on.

I will be adding to this list as soon as I find any new and useful addons..