Firefox – Disable 302 Redirects in Firefox

You can set an option to turn off consulting the cache if you have the developer toolbox panel open (as it happens with F12).

To set this option:

1. On any page, hit F12 to open the developer toolbox panel.
2. Click the gear icon in the top right of that panel.
3. There, check "Advanced Settings → Disable Cache (when toolbox is open)".

Cache redirects will still be cached from visits without the developer toolbox panel open, but that cache is not consulted and not updated as long as the developer toolbox is open. So you only temporarily force Firefox to not cache redirects or serve redirects from cache, but it could be enough for your use case.

Verified in Firefox 41. Adapted from Ryan Bemrose's answer to another question.

I realize this is far from a perfect answer, as this will only work for responses that serve up content, but I decided to post it as there are currently zero useful, actionable answers.

As a quick-and-dirty solution you may be able to use the debugger (accessible by F12 or CTRL+SHIFT+I in most browsers) to give your self an opportunity to opt out of a redirect.

Run this line in the console before the page runs any scripts of its own:

window.onbeforeunload = function(){ return 'Leave page?'; };

For example, using Chrome:

• Open the debugger (F12) and switch to the Sources tab.
• Press F8 to put the debugger into step-through mode.
• Navigate to the problematic page. It will begin to load but the debugger won't allow scripts to run.
• Paste the above code into the console and hit enter.
• Press F8 again to allow scripts to run and let the page finish loading.
• Now you will see a prompt before any redirect occurs and you'll have an opportunity to cancel it.
• If the page repeatedly tries to redirect you, you can tell chrome not to display the dialog again. Further attempts by the page to navigate you elsewhere will fail silently.