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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.
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
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...
Ziftr Alerts (formerly FreePriceAlerts)
You do the shopping. We'll do the searching. It's that simple.
google-pagerank
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.
Minimeter Requires Restart
Monitor your provider's upload/download usage meter.
Not maintained anymore, looking for a developer, contact me if you're interested.
Disable Addon Compatibility Checks (Version 4-56)
Reinstates the extensions.checkCompatibility preference.
Nagios Checker Requires Restart
The statusbar indicator of the events from the network monitoring system Nagios.
mozCleaner
Cleans your Firefox, Thunderbird, SeaMonkey, Fennec (unstable), Instantbird and BlueGriffon.
Tooltip Plus Requires Restart
Show tooltips for links and images with URLs, icons, alt text, and long titles.
CipherFox Requires Restart
Displays the current SSL/TLS cipher, protocol and certificate chain in the Add-on bar and Site ID dialog
To create your own collections, you must have a Mozilla Add-ons account.