Type yahoo.com in the address bar, hit enter, the browser tries to connect for about half a second, then it stops, blank page, no sign of browser trying to load anything. Click the reload button, the yahoo.com in the address bar disappear. and nothing happens, so I have to re-type the address again.

I have to repeat the process (typing the yahoo.com in the address bar and hit enter) so many times to make the page load.

Other webpages work fine. Only yahoo has the problem.

Happens only in Firefox. Happens in the two OSes (OS X 10.9.5, Firefox Dynasty 143.0.4 and macOS 10.14.6, Firefox 115esr).

No problem in Chrome.