Clear 301-redirect cache in Firefox

Locate the site you are redirected from in the History sidebar. Right-click it and select "Forget about this site".

No addons required!

P.S. I'm pretty sure this didn't work in the past, but nowadays following the redirect and then clearing the cache for past hour will actually remove the cached redirect.

P.S. The current best solution is to use "Web Developer Tools" (Ctrl+Alt+I), click "Network" and click "Disable cache". Load the original URL. Enable the cache again. The page is refreshed in the cache and the original URL is accessible also from other tabs now.

The quickest way to remove the cache in Firefox, which includes 301 redirects, is the following:

• Press CTRL + SHIFT + Delete
• Change the time range, if needed
• Click on Details and uncheck everything other than "cache"

Here is the simple solution for this in Firefox:

Hamburger menu -> Preferences -> Privacy & Security -> Clear Data (under Cookies and Site Data)

Make sure "Cached Web Content" is checked. You probably want to uncheck "Cookies and Site Data". And then click "Clear", and it's done.

The only solution I've found so far - short of clearing the whole cache - is the "Disable entire cache" toggle in Web Developer Toolbar. Once disabled you hard reload the page and you get the new version (remember to uncheck the toggle after you're done).