Open current tab in an incognito window. Use its toolbar button or the context menu option to open the current tab in a new private window.
Forget Tab is a simple and very lite Addon to easily clear history, cookies, storage and other info from current tab. Just click on the toolbar icon to clear desired items. A notification will show you what is cleared from current tab.
Very simple add-on that closes the current tab and make Firefox forget about the visit: suppressing cookies related to the current page, cleaning (beware : may be partial) the browser history and so on.
With "Forget That Page", you can totally delete the current webpage from your browsing history, just in one click ! It also deletes cookies, session storage, local storage and download history for that page.