Top 5 Firefox Addons.

Linkification.

This addon is great, basically what it does is finds any links on the page and converts them into clickable links! Completely cuts out copy&paste! Makes everything so simple.

Linkification addon page.

AutoPager.

This is another great addon, if you are looking through Google images this addon would automatically load up the next page onto the bottom of the one your currently browsing so you don't have to keep switching, it also has settings for loads of websites!

AutoPager addon page.

Full Fullscreen.

This little addon actually gives you fullscreen when you press F11, It gets rid of everything except the browsing windows and the tabs. Makes things look a lot nicer. Also goes well with Stylish.

Full Fullscreen addon page.

Stylish.

This addon customises the web in a way I have never seen before, certainly a good idea! This lets users load styles for different web pages, for example when on you tube you can have all the ads removed and it will load the pages with HQ or HD videos in bigger but not fullscreen. You can also make pages look a lot better and more compact and ad free.

Stylish addon page.

No Script

This addon blocks all scripts from being run in the current page, so any malicious Java or cross site XSS cannot be run and exploit any loopholes or security problems your computer may have. Also this is the best ad blocker I have ever had as it stops the ads from loading.

No Script addon page.

There are many many more addons avaliable here!