Mess on the panel.

GO to SlimStat > Settings > Maintenance and click the NO PANIC button.

A review for SlimStat would be a nice way to say thank you
https://www.ads-software.com/support/view/plugin-reviews/wp-slimstat

I did it and the problem still on.

Try with a different browser, see if that works. Clear all your caches.

Is working fine when I access with the internet explorer. I think it was some addon that I added in firefox.

Thank you.

I found the culprit, was the ad block.

I disabled her for my site and returned to normal.

YAY

A review for SlimStat would be a nice way to say thank you
https://www.ads-software.com/support/view/plugin-reviews/wp-slimstat