403 Forbidden

This is probably an issue with the server and you will need to take it up with the people running the website. The error means that you are trying to access something which the server will not allow. One example is where you enter the name of a directory - as you are doing here - and that directory does not contain an index.html or index.html file (which would be opened automatically). In this situation the server would display a list of the contents of the directory, except that most servers are set up not to allow this.

Have you tried disabling any extensions you have installed?

Cleared history?

Are you running any anti - virus programs? Using a VPN?

Try setting up another admin user account in System Preferences/Users & Groups to see if the same problem continues. Please post back on whether or not this worked. Also try the Safe Mode. Please post back on whether or not this worked.

Isolating an issue by using another user account 

Safe Mode - About

If it works in the Safe Mode, try running this program when booted normally and then copy and paste the output in a reply. The program was created by Etresoft, a frequent contributor.  Please use copy and paste as screen shots can be hard to read. Click “Share Report” button in the toolbar, select “Copy to Clipboard” and then paste into a reply. This will show what is running on your computer. No personal information is shown. If the log won’t post, try posting it in Pastebin and provide a link in a reply. After pasting the report in a PasteBin page, go to the top of the page, and copy the address in the URL bar. Paste that in a new reply.        Pastebin

Etrecheck – System Information

Web site version if required.  https://etrecheck.com

There's a problem with the website, nothing you can do about that.