failed to open page on Safari

You are welcome. Someone posted the other day that they had problems with that web site.

Try another browser as a test.

Firefox        10.9 or higher

Opera Browser        10.9 or higher

SeaMonkey      10.9 or higher8

Waterfox          10.8 or higher

It may not help, but try running/posting the Etrecheck report in your normal account. 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

  Force Quit Safari

  “Press these three keys together: Option, Command, and Esc (Escape)

  Or choose Force Quit from the Apple () menu in the upper-left corner of your screen.

  Select the app in the Force Quit window, then click Force Quit”

  Launch Safari holding the shift key down.

  https://support.apple.com/en-us/HT201276

If the above doesn't work, 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

You are welcome.