Dana Ross

This plugin displays a message at the top of the screen for visitors running outdated versions of the most popular browsers:
<ul>
<li>Internet Explorer 6 SP2 or less</li>
<li>FireFox 2 or less</li>
<li>Safari 2 or less</li>
</ul>
It is designed to be unobtrusive. The message disappears after a few seconds, and it only displays the first time the visitor comes to your WordPress blog/site.
The warning reads: It appears that you are using an outdated version of your browser. Please upgrade your browser for better sercurity and an improved experience.
The message also includes a link where the newest version of the browser can be downloaded.

Dave’s Outdated Browser Warning

Markus Wiesenhofer

Polylang is a fantastic plugin to make WordPress multilingual. The Polylang extension enables you to detect the preferred language according on the country.
If your website contains 2 different locales with the same language (e.g. de_DE for German/German and de_AT for German/Austria) then Polylang automatically sets the language according to the browser settings.
Austrian website visitors who have set their operating system / browser to Germany (e.g. the Devices was buyed in Germany) will always be redirected to de_DE.
This Plugin detects the preferred language according on the visitors country and will set the language correct to de_AT.
Please notice that the IP API is only for non-commercial use allowed.
<h4>Required Plugin</h4>
<ul>
<li><a href="https://polylang.pro" rel="nofollow ugc">Polylang Pro</a> by WP SYNTEX – Polylang allows you to create a bilingual or multilingual WordPress site.</li>
</ul>

Polylang – Country Detection

This plugin detects the preferred language according on the country.

Dave’s Outdated Browser Warning vs Polylang – Country Detection