Safari suddenly not working on iMac and MacBook

I've been using Safari as my main browser for years and about a week ago it just stopped working on both my iMac and MacBook.
I can open it, but it just brings up an "Untitled" screen and the progress bar stays at 1/3 on the home page I have set.
I've tried clearing the cache and the history, restarting. Nothing. I opened Firefox and it works fine. I don't mind Firefox, but I really prefer Safari so would love to figure out why this is suddenly happening.
Does anyone have any insight?

Back up all data.
Unlock the Network preference pane, if necessary, by clicking the lock icon in the lower left corner and entering your password. Cllck Advanced, open the DNS tab, and change the server addresses to the following:
          8.8.8.8
          8.8.4.4
That's Google DNS. Click OK, then Apply.
In Safari, select
          Safari ▹ Preferences... ▹ Privacy ▹ Remove All Website Data
and confirm. If you’re using another browser, empty the cache. Test. Any difference?
Notes:
1. If you lose Internet access after making the above change to your network settings, delete the Google servers in the Network preference pane, then select the TCP/IP tab and click Renew DHCP Lease. That should restore the original DNS settings; otherwise restore them yourself. Remember that you must click Apply in order for any changes to take effect.
2. I don't use Google DNS myself, though I have tested it, and I'm not recommending it or any other DNS provider; the server addresses are offered merely for testing purposes. There may be privacy and technical issues involved in using that service, which you should investigate personally before you decide whether to keep the settings. Other public DNS services exist.

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Safari suddenly not working on iMac and MacBook

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