It appears that AdBlockPlus are doiung this through the 'URL Fixer' addon at https://addons.mozilla.org/en-US/firefox/addon/url-fixer/, which they also use to make money off the typo-correction procedure (using affiliate links). There's more information at https://addons.mozilla.org/en-US/firefox/addon/url-fixer/. I'll drop them an email shortly. Richard Symonds Wikimedia UK 0207 065 0992 Wikimedia UK is a Company Limited by Guarantee registered in England and Wales, Registered No. 6741827. Registered Charity No.1144513. Registered Office 4th Floor, Development House, 56-64 Leonard Street, London EC2A 4LT. United Kingdom. Wikimedia UK is the UK chapter of a global Wikimedia movement. The Wikimedia projects are run by the Wikimedia Foundation (who operate Wikipedia, amongst other projects). *Wikimedia UK is an independent non-profit charity with no legal control over Wikipedia nor responsibility for its contents.* On 26 November 2012 10:11, John Vandenberg <jayvdb(a)gmail.com> wrote:

The ability to turn this on or off for your browser is unfortunately hidden away in a tab in the 'Filter preferences ...' of ABP. There's also an individual whitelist there. It's probably worth reading the developer's blog at http://adblockplus.org/blog/typo-correction-feature-in-adblock-plusfor a good overview of how it all works. -- Doug On 26 November 2012 11:49, Andre Klapper <aklapper(a)wikimedia.org> wrote: