I have been a Firefox user since a very long time, but I rarely install new plug-ins and add-ons unless I really need them. Recently, I came across the following two Firefox add-ons that I made my experience with Firefox much more pleasant. Wish I had come across them before.
FaviconizeTab
This extension allows you to minimize the size of a tab to the size of a favicon. This is perfect if you usually open a lot of tabs in your Firefox browser. It also has an auto faviconize feature, whereby it will automatically faviconize URLs that you specify.
Tabloc
This add-on allows you to lock, shift lock and protect tabs. Whenever a link is clicked in a locked tab, it opens up in a new tab, whereas a protect tab prohibits the closing of a tab.
Use the above two extensions together and you shall optimize your Mozilla Firefox experience!