Try the following code:
add_action( 'admin_head', 'ask_for_activation' );
function ask_for_activation() {
?>
<script type="text/javascript">
jQuery(function($){
$('span.activate a').click(function(e){
var c = confirm('Are you sure wnat to activate?')
if(!c) {
e.preventDefault();
return false;
}
return true;
});
});
</script>
<?php
}
You can add those codes in your functions.php in the theme, if you think your theme won’t be changed. Otherwise mu-plugins is the best solution. To use mu-plugins, go to /wp-content/ and find the folder with name ‘mu-plugins’. If there is no folder in that name, then create a folder, name it ‘mu-plugins’, create a file inside that, give any name you like and paste the code in there. You don’t need to activate that plugin. Mu-plugins means must use plugins, so it will be activated automatically always. If you use mu-plugins then add a php start tag at the beginning of the code.