Not at the moment, but it's planned. I checked 4chan and styling works OK in Chrome, but not Firefox so there must be something specific in Firefox that's causing an issue. I'll look into why this may be happening.

Edit 11/19/2018: FYI - A new version of the plugin has been released today (1.0.10) that should fix the issue you were experiencing.

I did not, but maybe I should. I've thought about reaching out to a project like Brave that includes privacy protections in the default configuration. Either way, I would want to review the Firefox source first and determine how such an implementation would be handled. There are advantages to including such protections within the browser itself; but, the negative is that it breaks compatibility with the CSS specification standard. The flaw isn't necessarily within the browser, but in CSS itself.

Thanks for the review! You should be able to find it on the Chrome store by searching 'CSS Exfil Protection'. I also have a direct link from the vulnerability tester page: https://www.mike-gualtieri.com/css-exfil-vulnerability-tester

Thanks for the suggestion! I plan to add a few new features into the popup area so for the time being I need to keep the icon click for opening the popup. If you need to disable the plugin because it's not working on a site, please let me know what site is causing problems and I'll get a fix out asap!

Thanks for the comment and review! A whitelist is a great idea I'll work into a future release. In the meantime, could you leave a comment on my website with the site(s) that are causing issue? I'd like to see if this is due to a bug / false positive, or if it is legitimately blocking styles which would cause issue.