Undo “Allow” for “Firefox prevented this page from automatically redirecting to another page”

Question

I accidentally pressed "Allow" for a webpage when the popup with "Firefox prevented this page from automatically redirecting to another page" appeared, I would like to undo the "allow" that I did, but can't find out how.

Answer 1

Try this:

• Clear Cookies & Cache
• Clear the Network Cache

Then :

1. click Firefox button and click Options -> Advanced -> General -> Remove Checkmark from Warn me when websites try to redirect or reload the page
2. Click OK on Options window -> Restart Firefox

[Source on the mozilla support forum]