How to forcibly close tab, no question asked

I was looking for images of various PDAs on Google. One of the images obviously resided on a sketchy site, since I got a popup window saying that a I had a virus (or somesuch) and that I should scan my computer. I encountered a few windows in my tale of woe, so I can't recall whether this first one was an actual Windows window or one of those windows that are part of the webpage. When I tried to close the tab, I got two popups (I think they were real Windows windows). One asked for permission to download and exe file while another said that the web page wanted me to confirm that I actually wanted to navigate away from the page. The latter, I've seen before; the former, well that's obviously malware. However, I wasn't confident about any windows anymore. What if I clicked on the Cancel for downloading the exe, but it was a phony Cancel that actually downloaded the exe? What about the confirmation to navigate away, is there a way for malware designers to fake such a window so that if I confirm, it will actually do something else?
And what if the answers to both were "no" as far as anyone knows at present, but it is theoretically possible for the answer to be "yes" (which means that it will likely happen at some undetermined time in future, given the resourcefulness of people)? Because of this last possibilty, I figure that best possible way to close such a tab is for a browser to allow the user to tyranically close a tab without any questions or confirmations. I don't want to the firefox window because I have other tabs that want to retain. (I'm not even sure it would been allowed to go ahead in the presence of the popup windows). I don't quite recall, but I might have killed the firefox process in the task manager, but if I restart firefox and restore tabs, the bad tab will also be restored.
So is there a way to forcibly close a tab, no questions asked?

Set the Integer pref browser.sessionstore.max_resumed_crashes to 0 on the about:config page to get the about:sessionrestore page immediately with the first restart after a crash has occurred or the Task Manager was used to close Firefox.
* http://kb.mozillazine.org/browser.sessionstore.max_resumed_crashes
That will allow you to deselect the tab(s) that you do not want to reopen, but will allow to reopen other tabs.
See:
* http://kb.mozillazine.org/Session_Restore#Restoring_a_session_after_a_crash
* http://kb.mozillazine.org/Browser.sessionstore.max_resumed_crashes
You can add this line to user.js to set that pref.
*http://kb.mozillazine.org/user.js_file
<pre><nowiki>user_pref("browser.sessionstore.max_resumed_crashes", 0);</nowiki></pre>

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http://i1224.photobucket.com/albums/ee374/Diavonex/Album%207/0752b2c9b46c96453b6 7d05d92d17783.jpg

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*http://kb.mozillazine.org/Profile_folder_-_Firefox
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*http://en.wikipedia.org/wiki/Screenshot
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How to add "Close Tab" to firefox's right click context menu?

william
Hongkong
2011-4-19

the-edmeister,
thankyou for your message
i know there are plenty of addons that can handle the job
i am in fact looking for whether there is a user setting capable of this
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https://addons.mozilla.org/zh-TW/firefox/addon/rights-to-close/
https://addons.mozilla.org/zh-TW/firefox/addon/closetab/
will check out the one you said in your message
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Useful links:
[https://support.mozilla.com/en-US/kb/Options%20window All about Tools > Options]
[http://kb.mozillazine.org/About:config Going beyond Tools > Options - about:config]
[http://kb.mozillazine.org/About:config_entries about:config Entries]
[https://support.mozilla.com/en-US/kb/Page%20Info%20window Page Info] Tools (Alt + T) > Page Info, Right-click > View Page Info
[https://support.mozilla.com/en-US/kb/Keyboard%20shortcuts Keyboard Shortcuts]
[https://support.mozilla.com/en-US/kb/Viewing%20video%20in%20Firefox%20without%20a%20plugin Viewing Video without Plugins]
[http://kb.mozillazine.org/Profile_folder_-_Firefox Firefox Profile Folder & Files]
[https://developer.mozilla.org/en/Command_Line_Options#Browser Firefox Commands]
[https://support.mozilla.com/en-US/kb/Basic%20Troubleshooting Basic Troubleshooting]
[https://support.mozilla.com/en-US/kb/common-questions-after-upgrading-firefox-36 After Upgrading]
[https://support.mozilla.com/en-US/kb/Safe%20Mode Safe Mode]
[http://kb.mozillazine.org/Problematic_extensions Problematic Extensions]
[https://support.mozilla.com/en-US/kb/Troubleshooting%20extensions%20and%20themes Troubleshooting Extensions and Themes]
[https://support.mozilla.com/en-US/kb/Troubleshooting%20plugins Troubleshooting Plugins]
[http://kb.mozillazine.org/Testing_plugins Testing Plugins]

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* https://support.mozilla.com/kb/Safe+Mode
* [[Troubleshooting extensions and themes]]

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How to forcibly close tab, no question asked

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