Due to Mozilla's continued lack of professionalism we have stopped development of the Firefox version of this extension. Hopefully they will get their act together so that we can resume development, but until then you can use the Chrome version of the extension, which continues to be fully supported.
Joomla Version Check determines if web pages are powered by Joomla, what version they are running, and indicates if the version in use is outdated.
Joomla 1.6, 1.7, and 2.5.0-2.5.2 have a serious security vulnerability
and websites still running those versions should be upgraded as soon as possible.
The extension is also available for Chrome
The same functionality is also available in a web based tool
You can find the instructions for upgrading Joomla here
.Need Joomla Upgraded?
We can upgrade your website to the latest version of Joomla
If your Joomla website hasn't been kept up to date and has been hacked we can clean it up for you