Weirdly, if I use a Google search results page to go to the site, it does load:

https://www.google.com/search?q=site%3Atools.goblinist.com

This sometimes indicates that the server is hacked and attack code or spam advertising is being injected based on the method of navigation to the server. However, I have not tried to analyze it closely.

Try using this link: http://tools.goblinist.com/ Then make your way to where you want to be.

This website only works if you use the HTTP protocol and not with the secure HTTPS protocol, so it won't work if Firefox forces a secure connection.

In case you use HTTPS-Only mode then Firefox may force a secure connection and thus will fail. You can create an 'Off' exception for http://tools.goblinist.com

• https://support.mozilla.org/en-US/kb/https-only-prefs

I do not have HTTPS-Only mode turned on.

Having said that, when I try to enter the http version it is being updated to https by the time I get the error message.

I tried to turn off the browser autofill (toggled to false) to stop it forcing https but it still does it.

Same result (and still ends up showing https version.

You can remove all data stored in Firefox for a specific domain via "Forget About This Site" in the right-click context menu of an history entry ("History -> Show All History" or "View -> Sidebar -> History").

Using "Forget About This Site" will remove all data stored in Firefox for this domain like history and cookies and passwords and exceptions and cache, so be cautious. If you have a password or other data for that domain that you do not want to lose then make sure to backup this data or make a note.

You can't recover from this 'forget' unless you have a backup of involved files.

If you revisit a 'forgotten' website then data for that website will be saved once again.

• https://support.mozilla.org/en-US/kb/delete-browsing-search-download-history-firefox

I tried that in my first batch of "fixes".

Tried again because hey, why not... Same issue.

I just tried enabling https only mode, adding an exception and visiting the site. It gave me the warning & option to continue to the http version so I tried that. It still gave me the same original error (and shows https in the address bar).

I decided to reinstall and it worked once. So I thought it was solved.

Then I reimported my saved bookmarks and passwords and it's back to not working.

I checked the bookmark I have for it and it is definitely http.

So I am at a loss.

Accidental duplicate

Any difference in a private window (right-click > Open Link in New Private Window) ?

Private window acts the same.

You can remove all data stored in Firefox for a specific domain via "Forget About This Site" in the right-click context menu of an history entry ("History -> Show All History" or "View -> Sidebar -> History").

Using "Forget About This Site" will remove all data stored in Firefox for this domain like history and cookies and passwords and exceptions and cache, so be cautious. If you have a password or other data for that domain that you do not want to lose then make sure to backup this data or make a note.

You can't recover from this 'forget' unless you have a backup of involved files.

If you revisit a 'forgotten' website then data for that website will be saved once again.

• https://support.mozilla.org/en-US/kb/delete-browsing-search-download-history-firefox

I tried that originally and it had no impact.

I tried again (forget site, close/reopen FF) and it still doesn't change anything unfortunately.