Jay Versluis

Show Me The Cookies displays all current cookies your site is using. Once activated, you can find this list under Appearance – Cookies.
Furthermore you can display this list to your visitors by placing the shortcode [cookies] into any post or page.
WordPress uses several cookies under the hood by default. If you’d like to filter these out, you can use the shortcode [cookies-nowp]. If you like, you can replace the default separator between the cookie name and its value by adding your own string between the opening and closing shortcode tags, for example [cookies] ==> [\cookies].
This plugin is based on code by David Artiss, who kindly made it available on GitHub. I’ve wrapped it up into this standalone plugin.
To find out more about what cookies are and what can be done with them, please read https://en.wikipedia.org/wiki/HTTP_cookie

Show Me The Cookies

Shows a list of all current cookies on your site, both for admins and visitors (optional).

xhtmlweaver

This plugin can greatly improve the user experience for your blog, by automatically and periodically saving the “just typed comment” for your visitors (the content textarea input box in comment section). The just typed comment is saved into browser’s local storage system to prevent loss of any unsubmitted comment from your visitors and doesn’t require any backend support.
This is similar like WordPress can remember your Name, Email, Website in comment area for the next visit, but WP Local Storage plugin extends this into next level, it can remember the actual unsaved comment (i.e. before hit submit button) so even the browser is crashed before the user hit save, it is okay! When the user came back, all “just type comment” will be still in there.
Full Support is available at http://www.xhtmlweaver.com or wp-support@xhtmlweaver.com

WP Local Storage

This plugin automatically and periodically saves the "just typed comment" for visitors so no data will be lost even the browser crashed.

Show Me The Cookies vs WP Local Storage