Yarick

This plugin notifies user if browser check failed. Available checks:
<ul>
<li>Browser version (Chrome, Firefox, Safari, Opera, IE)</li>
<li>JavaScript enable</li>
<li>Cookie enable (require JavaScript)</li>
<li>Adobe Flash Player version (require JavaScript)</li>
</ul>
You can select style for notice. Or disable plugin CSS and write own.
User can close notice to time you set in minutes. It use cookie. You can disable close button.
Also you may set next check time in days. When check is successful.
Browser Check may be integrated with theme. Just place this code: “do_action(‘browser_check’)” in your theme. And disable plugin css from “Settings -> Browser Check” page and write own css for best look in your theme.
Supported languages
<ul>
<li>English</li>
<li>Russian</li>
</ul>

Browser Check

Check browser version, JavaScript, Cookie, Adobe Flash Player version. Warn user if old.

ldebrouwer

An up-to-date WordPress installation is as safe as it can be, plugins however can often pose a security risk because they’re not maintained by hundreds of contributors. A plugin is as secure as the security knowledge of the developer allows it to be. In some cases this creates loopholes for exploits. WP Plugin Security Check checks plugins for bad practices and possible security holes limiting the risk of a compromised WordPress installation to a ‘hate to say I told you so’.

WP Plugin Security Check

WP Plugin Security Check checks if your WordPress plugins are 'safe'.

Browser Check vs WP Plugin Security Check