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Check4Change

Check4Change (aka C4C) is a simple extension that allows you to select a part of a web-page, and get notified when it changes.

Rated 4 out of 5 stars (156)
23,611 users

HTML Desktop Notifications

Extension to add desktop notifications into firefox, the way it works with Chrome and Chromium Browser : works with gmail, gtalk (gmail chat), imo.im, and all other websites that use this technology.

Rated 4 out of 5 stars (52)
22,093 users

Ciuvo - Price check in your Browser No Restart

Ciuvo finds best deals for your wanted product. Price check, comparison, customer reviews, product videos and coupons right in your web browser.

Rated 5 out of 5 stars (119)
20,926 users

Simple Popup Blocker No Restart

Simply toggle between three different popup blocking modes: allow all, allow requested or block all. Now with tracking protection.

Rated 5 out of 5 stars (19)
20,643 users

Gmail panel

Check and do whatever you want into your Gmail easily with a panel.
It also alerts you the unread emails.
***You need to have enabled the "Unread message icon" (Settings > Labs)***

Rated 4 out of 5 stars (78)
19,516 users

PriceBlink - Automatic Price Comparison & Coupons No Restart

**As seen on the Today Show, USA Today, ABC News**

Automatically finds lower prices and money-saving coupons from thousands of retailers while you shop. PriceBlink stays hidden until you are shopping. US and UK.

Demo: youtu.be/UKxMx5bT-QM

Rated 4 out of 5 stars (106)
17,809 users

WEB.DE MailCheck for Firefox

Mail notifier for multiple email accounts

Rated 4 out of 5 stars (34)
16,715 users

Distill Web Monitor (formerly AlertBox)

Monitor web page and feed for changes. Get SMS and email alerts when change is detected.

Rated 4 out of 5 stars (179)
15,890 users

WebRank SEO Toolbar Featured

A toolbar that gives Google Pagerank, Alexa, Compete and Quantcast Rank, pages indexed and backlinks in Google, Bing and Yahoo. Bookmark webpages at PickMeWeb.com, view similar websites at SimilarSites.com. Delicious, Digg and Tweet Count.

Rated 4 out of 5 stars (71)
14,728 users

Mind the Time No Restart Featured

Keep track of how much time you spend on the web, and where you spend it. A toolbar ticker shows the time spent at the current site or the total time spent on the web today. A summary page sums up data for the past 70 days, 10 weeks, and 6 months.

Rated 4 out of 5 stars (92)
13,271 users

Myibidder Auction bid sniper for eBay ("Snipe it")

Add a Bid Sniper to eBay auctions. It's linked to www.myibidder.com (originally www.myibay.com) Auction bid sniper for eBay service website where you can snipe and monitor your auctions for free.

Rated 5 out of 5 stars (120)
12,658 users

Webutation - Reputation & Security No Restart

Would you like to know which websites are safe and which website you can trust?
The Webutation add-on shows you the reputation of a site with a simple green/yellow/red icon and scans websites against virus and bad userfeedback. Works similar to WOT.

Rated 3 out of 5 stars (60)
12,651 users

Add-on Update Checker

Adds Tools menu item to check Add-ons for updates. Includes toolbar icon.

Rated 4 out of 5 stars (54)
12,560 users

Certificate Patrol

Your browser trusts many certification authorities and intermediate sub-authorities quietly, every time you enter an HTTPS web site. This add-on reveals when certificates are updated, so you can ensure it was a legitimate change.

Rated 4 out of 5 stars (75)
12,006 users

ABV Notifier

Official ABV.bg notifier.

Rated 3 out of 5 stars (67)
11,707 users

Skip Cert Error

This Firefox extension enables skipping the SSL/TLS certificate error page, for specific configurable conditions, like self-signed cert or unknown issuer, by adding a temporary exception.

Rated 4 out of 5 stars (34)
11,633 users

Nagios Checker

The statusbar indicator of the events from the network monitoring system Nagios.

Rated 5 out of 5 stars (60)
11,443 users

Telify

Converts telephone numbers into clickable links for use with CTI applications, SIP clients, Skype, Netmeeting, snom phones, the AGFEO TK-Suite Client and SerVonic IXI-PCS.

Rated 4 out of 5 stars (57)
11,242 users

Gmail Notifier

Note from Mozilla: This add-on has been discontinued. Try WebMail Notifier instead.

The original notifier for Gmail.

Rated 4 out of 5 stars (621)
11,064 users

Weather Underground (Forecast Plus) No Restart Featured

Provides local & long range Weather Forecast using Weather Underground

Rated 5 out of 5 stars (12)
10,962 users