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Close'n forget 0.11.6.1-signed
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.
About this Add-on
After installing the extension, find the new "close" button in the toolbar customization panel and drop it in your prefered place. Optionaly, you can add an entry in the contextual menu of each page.
Remember that you can also use <Alt> + W (or other) to close'n forget a tab.
Warning: In some rare cases, the browser history may not be cleared totally. Thus, this feature has been disabled by default.