MinimizeToTray revived Requires Restart

Minimizes windows into the system tray.

esri

This is an extension that enables "View in ArcGIS.com".

whatmon Requires Restart

Monitor Whatever: a tiny Firefox extension called whatmon, which can monitor almost anything you wish to monitor. Number of logged on users? Current load average? Health of your LDAP servers? Mail server queues? No problem for...

Caret Out Requires Restart

Disables change of the caret browse mode by shortcut key(F7).

Gmail Manager Requires Restart

The original Gmail notifier for multiple accounts. Allows you to receive new mail notifications along with viewing account details including unread messages, saved drafts, spam messages, labels with new mail, space used, and new mail snippets.

BNR Exchange Rates Requires Restart

Show the exchange rates from BNR in the statusbar.

WorldIP - Geo Add-on with Security Features Requires Restart

Professional Geo Add-on with security features and advanced network tools. Anti-phishing. Protection against DNS spoofing and fake sites. All DNS records for domain. The real location of web server, country flag, extended information about datacenter

Ziftr Alerts (formerly FreePriceAlerts)

You do the shopping. We'll do the searching. It's that simple.

google-pagerank

Minimeter Requires Restart

Monitor your provider's upload/download usage meter.
Not maintained anymore, looking for a developer, contact me if you're interested.

Update Notifier Requires Restart

Note from Mozilla: This add-on has been discontinued. Try Add-on Update Checker instead.

Notifies you when updates are available for your extensions and themes.

JSW:O Alert Requires Restart

Receive alerts for "Jet Set Willy: Online" hosted games

Disable Addon Compatibility Checks (Version 4-56)

Reinstates the extensions.checkCompatibility preference.

Only Minor Update Requires Restart

Applies only minor updates of the application.

IMEStatus Requires Restart

Show IME status by input/textarea/textbox background color.

mozCleaner

Cleans your Firefox, Thunderbird, SeaMonkey, Fennec (unstable), Instantbird and BlueGriffon.

Addons Recent Updates Requires Restart

Show more addons recent updates

CipherFox Requires Restart

Displays the current SSL/TLS cipher, protocol and certificate chain in the Add-on bar and Site ID dialog

Nagios Checker Requires Restart

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

Tooltip Plus Requires Restart

Show tooltips for links and images with URLs, icons, alt text, and long titles.