Aesthetics and so…

I’m such a lover of details 🙂

• The tabs UI in plugin pages looks kind of “disconnected” at the bottom. Apparently, this is due to the fact that you placed the <h2> with the class nav-tab-wrapper inside the div with the id poststuff which causes unintended padding for the <h2> tag. Consider moving nav-tab-wrapper out of (before) poststuff.
• Since WordPress 3.8, images for menu icons have been looking not-so-great on the new admin menu design. Consider changing the current image to one from the default dashicons font. May I suggest dashicons-shield?
• The labeling system of features is great (e.g. Basic, Advanced), yet it can easily be overlooked sometimes. I recommend applying color labels. For example, Advanced features can have the shield logo (or ribbon) colored red and so on.
• You write the version of this plugin preceded by the letter ‘v’, this makes it kind of odd-looking and duplicate at times. For example, the download button here on wordpress.org says “Download Version v3.7.3”, and in the plugins table in the backend it also says “Version v3.7.3”

I rest my trivial comments!

https://wordpress.org/plugins/all-in-one-wp-security-and-firewall/