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Simple YouTube MP3 Button

Adds a small and simple button to YouTube videos that allows you to quickly download the audio of the video as an MP3 file (quality of the MP3 is as high as the video offers) without having to leave the page.

Rated 5 out of 5 stars (48)
37,485 users

Zindus Requires Restart

Google and Zimbra contact sync for Thunderbird. (TB 24 and above NOT supported)

Rated 4 out of 5 stars (207)
25,065 users

Web Messenger for WhatsApp™

Web Messenger for WhatsApp™ brings WhatsApp right into your browser to chat with your friends.

Rated 5 out of 5 stars (5)
25,018 users

Save Button for Pinterest

Save images and pages to your Pinterest account quickly and easily with Save Button for Pinterest.

Rated 5 out of 5 stars (20)
82,066 users

GitHub Extension Installer

Install Browser Extensions straight from GitHub Repositories

Rated 5 out of 5 stars (12)
2,763 users

YouTube Video Player Speed

YouTube Video Player Speed play YouTube videos in whatever speed you want

Rated 4 out of 5 stars (4)
22,392 users

Sidebar for Facebook™

Sidebar for Facebook™ brings Facebook™ right into your Firefox. Get notifications, status and photos from Facebook™ instantly.

Rated 5 out of 5 stars (7)
4,039 users

ALLYouTubeDownloader Requires Restart

ALLYouTubeDownloader extention (FLV/MP4/WebM; HD/HQ). Windows only. Works only with ALL YouTube Downloader 2.3 application or higher (versions 2.2 and lower doesn't work anymore).
Homepage: http://www.allplayer.org/youtube-to-allplayer

Rated 3 out of 5 stars (8)
23,324 users

Messenger for Facebook™

Messenger for Facebook™ lets you bring a Messenger right into your browser to chat with your friends.

Rated 5 out of 5 stars (42)
27,314 users

Yahoo! Mail Notifier Requires Restart

This extension notifies you when new messages arrive in your Yahoo mailbox.

Rated 3 out of 5 stars (183)
6,752 users

Message Seen Disable for Facebook™

Message Seen Disable for Facebook™ lets you turn off Facebook™'s Message Seen feature automatically for your account. You can still use Seen feature for others.

Rated 5 out of 5 stars (11)
8,066 users

Forecastbar Enhanced Requires Restart

Note from Mozilla: This add-on has been discontinued. Try Forecastfox Weather instead.

Get international weather and weather forecasts with Forecastbar Enhanced.

Rated 4 out of 5 stars (167)
2,002 users

Share Button for Facebook™

Share Button for Facebook™ lets you share any web page on your Facebook™ Timeline by a quick button.

Rated 5 out of 5 stars (26)
9,812 users

YouTube Video Replay

YouTube Video Replay is a new tool that lets you replay YouTube Videos.

Rated 5 out of 5 stars (29)
9,212 users

YouTube Video Center

Youtube Video Center changes the new Youtube design and centers the whole Youtube page on the screen automatically.

Rated 5 out of 5 stars (12)
4,873 users

Toolbar Button for Facebook™

Toolbar Button for Facebook™ lets you visit your favorite Facebook™ quickly and easily by adding a special button to your Toolbar.

Rated 3 out of 5 stars (50)
24,098 users

LinkedTop Helper Requires Restart

Helper for working with LinkedTop.

Not yet rated
2 users

Video Pinner

Pins a YouTube video to the page so that it is always visible while you scroll and read comments. Port of Chrome's Video Pinner extension

Rated 2 out of 5 stars (3)
58 users

NDselector Requires Restart

Selector paginas Noticiero Digital y Aporrea

Not yet rated
2 users

Shop Companion

Access to full-resolution product images and videos on various shopping sites is easy with this add-on. It adds links to the largest/xxl/best-size version of product images on various shoppings sites.

Open-source code on github.com/ShopCompanion

Not yet rated
62 users