Sorry to hear that- it may be a version not supported by the AutoClean tool?
In which case here are some more options which I suggest you try in the order given...
1. Go to Control Panel > Programs and Features and in the Uninstall or change a program list - uninstall any entries for Ask/Ask Toolbar.
2. Go to Control Panel > Internet Options > Programs > Manage Extensions
And/Or
Control Panel > Internet Options > General > Change search Defaults
And remove any entries for Ask.
3. In Firefox go to Tools > Add-ons and look under Extensions for 'Ask' and select Remove if found there.
Restart Firefox and test?
Manual Removal
Ask can be installed by itself or with some Firefox extensions. In which case it's not always easy to remove manually. What follows are the steps I used a couple of months ago to rid a family member's Firefox install of this pestilence- however you continue at your own risk...
1. In Firefox open a new tab or window and type “
about:config” (without the quotes) into the address bar. A warning will be displayed and you can click the button marked "I'll be careful, I promise" to continue.
2. Enter the phrase "
Keyword.URL" (without quotes) into the filter/search bar at the top, and hit Enter. Right click on the entry and select “Modify”, then change Ask.com to- "
http://www.google.com/search?ie=UTF-8&oe=UTF-8&sourceid=navclient&q=" (without the quotes).
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3. Enter the phrase "
browser.search.defaulturl" (without quotes) into the filter/search bar at the top, and hit Enter. Right click on the entry and select “Modify”, then change Ask.com to- "
http://www.google.com/search?ie=UTF-8&oe=UTF-8&sourceid=navclient&q=" (without the quotes).
4. Enter the phrase "
extension.snipit.chromeURL" (without quotes) into the filter/search bar at the top, and hit Enter. Right click on the entry and select “Modify”, then change Ask.com to- "
http://www.google.com/search?&q={searchTerms}" (without the quotes).
5. Next, in the Firefox search bar, click the 'down' arrow and select "Manage Search Engines. Click the entry for Ask to highlight, and then hit the remove button.
Restart Firefox and test?
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If you get to here and have not managed to remove Ask completely then I suggest you email Ask.com support for further help.
Once you have removed Ask we can look at the new tab button/position, etc.