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Certificate Patrol
Requires Restart
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.
AdRemind.Me
Requires Restart
Want to keep your favourite Web sites alive even when you're using Adblock Plus? AdRemind.Me helps you to supporting your favourite Web sites in deactivating periodically Adblock Plus ad filters only on these sites for 20 seconds.
Disable Addon Compatibility Checks (Version 4-56)
Reinstates the extensions.checkCompatibility preference.
Tooltip Plus
Requires Restart
Show tooltips for links and images with URLs, icons, alt text, and long titles.
Telify
Requires Restart
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.
CipherFox
Requires Restart
Displays the current SSL/TLS cipher, protocol and certificate chain in the Add-on bar and Site ID dialog
Expiry Canary
Requires Restart
An extension to warn about nearly-expired website SSL certificates.
This simple addon probably needs updating for the upcoming changes in Firefox; however, I'm afraid I don't have time to learn the new stuff. If you can maintain it, contact me!
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
DSLR Notifier 2
Updated version of the original DSLR Notifier, created by Ryan Flint, which enables members of Dsl/Broadbandreports.com to keep tabs on their instant messages and updated...
N0HR Propfire
Requires Restart
HF radio propagation status displayed in your browser status bar. Shortwave radio enthusiasts, ham radio operators and others can use this to monitor solar conditions that impact radio propagation. Usage, updates and support can be found at...
PackageMapping.com Extension
Requires Restart
Track and Map packages from the right-click menu...
Nagios Checker
Requires Restart
The statusbar indicator of the events from the network monitoring system Nagios.
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...
eQuakeAlert!
Requires Restart
Have you ever thought of getting alerts on land disasters like earthquakes, right on your desktop? eQuakeAlert! is the solution for that!
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.
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.
To create your own collections, you must have a Mozilla Add-ons account.