Xmarks is the most popular bookmarking addon for firefox. This will keep your bookmarks, passwords synchronized between browsers and computers.
2. Tab Mix Plus
Tab Mix Plus is one of the most used addon for firefox which has may features like controling the tab, undo closedtab, duplicating tabs, tab clicking options and many more. Its also has a full featured session manager. So this extention will be more useful for the users.
Downthemall firefox extension adds a new advanced download capabilities to your browser. This allows you to download all the images and links that contained in a webpage. Downthemall addon for firefox is also can used as download manager. This let you pause and resume downloads at all time. This is one of the more powerful addon and it also easy to use.
4. AdBlock Plus
Adblock Plus firefox extention for firefox will block the online ads automatically form the list ad providers. For an annoyance free web surfing intall the adblock plus addon for
firefox and browse faster and safer with the control of the internet.
5. Personas Plus
Personas plus is one of the well known firefox extention which is easy to install skins for firefox. You will get easier access and know more about new, popular and your favorite personas with this built in funtionality.