Lots of WP plugins can do the same thing, but few provide this wide range of configuration features.
Browser Rejector comes with a WP backend panel where options can be tinkered to any scenario the admin might want to implement.
After activation, the plugin basically blocks access to any visitor using a browser type or version that the webmaster deems inappropriate.
This warning is shown inside a modal popup box that floats above the page.
Browser Rejector uses and is based on the jReject jQuery plugin.
Unpack and upload it to the /wp-content/plugins/ directory.
Activate the plugin through the 'Plugins' menu in WordPress.
Here are some key features of "Browser Rejector":
· Set modal popup box text
· Allow users to dismiss the popup
· GUI for setting which browser types and versions are considered deprecated
· Preview the modal before activation
· WordPress 3.3 or higher
What's New in This Release: [ read full changelog ]
· Confirmed WordPress 3.5 compatibility.
· wp_footer() action hook is now required again.
· Updated Firefox version to 17.