I am asking a general question on whether there is a way to do it.
However, the specific problem I am battling is that I went to http://foo.com and at the time the server was having problems and redirected me to http://foo.com/error.htm. The website was fixed and responds correctly, but Firefox still redirects me to http://foo.com/error.htm.
If I go to http://foo.com in private mode or in a different browser, the page renders fine. But in regular mode, Firefox just always redirects me to the initial redirect page.
P.S. Firefox 60.x, Windows 10
So how do I remove this piece of browser cache (without nuking the entire cache)?