Sooner or later you will have a browser issue with your WordPress site and you just can't fix it (or the effort seems insane) – Here is such a simple solution. It's a plugin that detects browsers (you choose which ones) and displays a message of your choice and links to alternate browsers. It's 5 stars and recently updated. It passed my first site test.
Advanced Browser Check
Tell IE users to change browser? Or is your site for chrome only? Now you choose what browsers should trigger a warning popup or not on your site.
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Post imported by Google+Blog. Created By Daniel Treadwell.