Rated 4 out of 5 stars

I don't like how instead of Disable/Enable etc..., it's now just Disable with the ABP icon disappearing and reappearing. It's confusing. It used to be that you disable the site, the page, or altogether and you can choose enable to turn it back on. Now you can't even tell because the words won't change. A minor gripe.

This review is for a previous version of the add-on (1.3.10). 

This is a bug in the custom theme you are using, with the default theme you will correctly see a checkmark next to that menu item.