The Mozilla developers introduced the Mozilla Plugin Check back in October 2009 as a way to inform users of the Firefox web browser about outdated plugins. Plugins that are not up to date can pose both a security and stability risk.
The plugin check would analyse the plugins of the web browser and compare their version to the latest version offered by the plugin’s developer to inform the user if the plugin is up to date or needs updating.
This plugin check has now been extended by the developers to work with other web browsers as well making it a web tool for everyone who wants to verify that the installed plugins are up to date.

All that needs to be done to check the installed plugins is to visit the plugincheck website to do so.
The online service can identify many popular plugins. The plugin database is maintained by Mozilla and constantly expanded. It can however happen that some plugins are not recognized automatically by the service.
Three different statuses are available: Up To Date confirming that the latest version of the plugin is installed, Update suggesting that the plugin is outdated and Research if a plugin cannot be identified yet by the service.
Links lead either to the developer’s homepage or a Google search depending on the individual plugin’s status.
Related Articles:
Mozilla Plugin CheckKeep Your Chrome Plugins Up To Date with Plugin Updater
Mozilla Checks Flash Version After Firefox Updates
Check and Remove Plugins in Firefox
How To Make Sure That Google Chrome’s Flash Plugin Is Up To Date
Enjoyed the article?: Then sign-up for our free newsletter or RSS feed to kick off your day with the latest technology news and tips, or share the article with your friends and contacts on Facebook, Twitter or Google+ using the icons below.

There’s also http://secbrowsing.appspot.com which does a similar job and also has Chrome extension.