In some cases, you want to delete cookies for just one website – in my case, it’s for the football manager game I play occasionally. The only way to get it to work is to delete the cookies for its website. But I don’t want to delete all of the cookies in Firefox.
Click the Firefox button and click Options.
Next click on Privacy and click Remove Individual Cookies.
In the window that pops up, type the name (or part of the name) of the website whose cookies you want to remove. Select the ones you want deleted by holding Ctrl and clicking or with the Shift key + cursor keys and click Remove Cookie.
Or you can click Remove All Cookies for a specific site if you want. Groovy!