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Custom 404 allow you to customize the 404 page style and content. 
It allows you to style your current theme 404 page or create a new one.
You can insert Widgets, Styles and Content. Custom 404 has minimal HTML. 
Everything is done with live preview.
You can customize an 404 page for each of your themes, simply as customize your theme.

Custom 404

A plugin to remove all pending comments from your DB in one click. A useful tool if you’ve been heavily spammed or have not managed your blog for a while and would just like a fresh start for your comments. Note that this will not modify any previous that are not marked as unapproved.

Bulk Comment Remove

A plugin to remove all pending comments from your DB in one click.

Custom 404 vs Bulk Comment Remove