I cant delete the extension https: /?sk=h_chr. It is a remnent from Facebook Purity that I did not like and got rid of. Facebook.com is in the address bar, but when I click on something on Facebook page, the extension attaches itself, and causes my laptop to screw up. Usually have to restart. Facebook Purity has not been any help in resolving this issue. The extension does not show up in any firefox or chrome setteing so that i can block or delete it. I am beyond frustrated. Can anybody help?