2009 can be described as the a rebuilding year for Firefox add-ons. Moreover, two new frameworks were implemented to help guide the future of extensions. Personas gave Firefox users the ability to trendily personalize their browser. Now we all expect it to be part of the stable version of Firefox 3.6. Jetpack takes a similar approach to feature add-ons, allowing developers to create feature-rich add-ons from little more than HTML, CSS, and javascript. It can be expect that JetPack to eventually be part of Firefox by default.

Below, we suggest a brief review of some of Firefox most interesting add-ons for this year.

Weave Sync is Mozilla Labs project, yet, it’s not very clear whether it’s going to be part of Firefox as a default feature. The add-on, developed by Mozilla Labs aims to synchronize Firefox across computers and devices. It introduces incremental more-streamlined and less-obtrusive syncing, fitting in smoothly in your Options pane. Although it still has some problems with some extensions, including the popular AdBlock Plus, in general it works well and brings a long-missing feature to Firefox.

Multi links has a simple purpose, but it’s so effective that it can be pointed as one of the best add-ons of the year. Thanks to Multi links, users are bale to open numerous links from a search engine result list or a web page. Just right-click in a browser tab and drag it, highlighting multiple links in the box. By default, selected links open up in new browser tabs, although you can go into the options to choose whether you want them to open up in new windows, or be bookmarked instead. You're also able to change the color scheme of the box, and the outlines of the selected links.

Known as SmarterFox, FastestFox is a multitasking add-on that helps make searching, pasting, surfing, and downloading faster. Highlight a word or phrase on the Web page and FastestFox will display a bubble filled with search engine icons. After a few seconds of inactivity, the search bubble disappears.

No matter whether you you're looking for an unobtrusive panic button, or your just need to clear your screen of the numerous tabs for moment, HideTab can definitely help you. You can hide all of them at once, or merely some of them – just don't forget that the hidden tabs are still running although they’re not visible.

WebReview makes your start page smarter and offering more suggestions you may like. It’s based on past browsing habits. It's a bit like the Speed Dial feature in Opera, Chrome's new tab page, or Top Sites in Safari, but it’s developed in Firefox style. It tells you the last batch of tabs you had open, along with most visited pages. But it also shows you a group of sites you visit daily; along with a suggestion of sites you may be interested in visiting. It sorts these out by what day it is, along with the time.

WebReview also offers a replacement history tracker, allowing you to search by domain or number of visits. Sites in the WebReview history come with thumbnail previews. Lastly, there's a Graph View, showing the trail of how you move from site to site for that entire session. You can also go back to specific days and see a large graph for the entire day. It's visually appealing and exploratory at the same time.

PageZipper takes stories split over multiple pages and "zips" them into one. It's a bit unstable and doesn't play perfectly with Flash- or javascript-based photos, but in general works well. It's also developed to be inoffensive to publishers, who often have legitimate reasons for splitting content into multiple pages. The "zipping" loads the next page in full below, including ads, so their potential revenue goes unharmed. The reader, on the other hand, benefits from significantly less clicking.

Wikipedia Diver goes deep into your Wikipedia browsing to provide a fascinating look at what you've been researching. It organizes your Wikipedia searches down to the day, order, and session in which you visited the sites, making it easy to revisit old entries. Fortunately, all this data is kept on your local computer and not in the cloud, so there are no privacy issues.