Not having the latest security updates for your web browser or plugins is detrimental to your online privacy and security.
Using Internet Explorer? Click the following link to update your software: https://browsercheck.qualys.com/
Using Firefox? Click the following link to update your plugins: https://www.mozilla.com/en-US/plugincheck/
This is what the web sites look like:
Qualys’ free browser security checker:
Firefox’s own PluginCheck page:
Kudos to Julien who pointed out the Qualys BrowserCheck tool.