The page you are trying to view cannot be shown because the authenticity of the received data could not be verified.
   Please contact the website owners to inform them of this problem."

I've been using Firefox for a week now and every time I work on my clients WordPress websites they show this message after a few hours of working on them: "Secure Connection Failed An error occurred during a connection to 4everyoung.com.br. PR_END_OF_FILE_ERROR The page you are trying to view cannot be shown because the authenticity of the received data could not be verified. Please contact the website owners to inform them of this problem." When this message appears I need to restart my computer for the website to load again, when I use the websites on Chrome they don't show this error but if this error appears on Firefox, the website also stops loading on Chrome until I restart my computer. I've realized that activating and deactivating plugins will make this error appear but sometimes I'm just working on the website normally. This doesn't happen on any other websites, only my clients websites that I manage. All of them use WordPress but some are hosted by Hostgator and others are hosted by Hostinger. I've followed the steps of every forum post out there about this issue, contacted my hosting providers and they have no idea as to what may be causing this issue.