{"action":"created","issue":{"url":"https://api.github.com/repos/pyllyukko/user.js/issues/120","repository_url":"https://api.github.com/repos/pyllyukko/user.js","labels_url":"https://api.github.com/repos/pyllyukko/user.js/issues/120/labels{/name}","comments_url":"https://api.github.com/repos/pyllyukko/user.js/issues/120/comments","events_url":"https://api.github.com/repos/pyllyukko/user.js/issues/120/events","html_url":"https://github.com/pyllyukko/user.js/issues/120","id":134165445,"number":120,"title":"Font fingerprinting","user":{"login":"publicarray","id":5497998,"avatar_url":"https://avatars.githubusercontent.com/u/5497998?v=3","gravatar_id":"","url":"https://api.github.com/users/publicarray","html_url":"https://github.com/publicarray","followers_url":"https://api.github.com/users/publicarray/followers","following_url":"https://api.github.com/users/publicarray/following{/other_user}","gists_url":"https://api.github.com/users/publicarray/gists{/gist_id}","starred_url":"https://api.github.com/users/publicarray/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/publicarray/subscriptions","organizations_url":"https://api.github.com/users/publicarray/orgs","repos_url":"https://api.github.com/users/publicarray/repos","events_url":"https://api.github.com/users/publicarray/events{/privacy}","received_events_url":"https://api.github.com/users/publicarray/received_events","type":"User","site_admin":false},"labels":[],"state":"closed","locked":false,"assignee":null,"milestone":null,"comments":16,"created_at":"2016-02-17T03:16:35Z","updated_at":"2016-02-19T12:27:22Z","closed_at":"2016-02-17T15:56:09Z","body":"I have found out that `browser.display.use_document_fonts` can be used to disable font fingerprinting. I have used it in my own user.js and have not found a problem with it. I recommend adding it to this project.\r\n\r\n```js\r\n// disable front fingerprinting\r\n// test with http://www.browserleaks.com/fonts or https://panopticlick.eff.org\r\nuser_pref(\"browser.display.use_document_fonts\", 0);\r\n```\r\n\r\nbefore:\r\n![screen shot 2016-02-17 at 1 04 16 pm](https://cloud.githubusercontent.com/assets/5497998/13098825/e210b30c-d577-11e5-805e-cbbdd811e184.png)\r\nafter:\r\n![screen shot 2016-02-17 at 1 05 06 pm](https://cloud.githubusercontent.com/assets/5497998/13098826/e43abf56-d577-11e5-9abd-c9155fdf00bd.png)"},"comment":{"url":"https://api.github.com/repos/pyllyukko/user.js/issues/comments/186197202","html_url":"https://github.com/pyllyukko/user.js/issues/120#issuecomment-186197202","issue_url":"https://api.github.com/repos/pyllyukko/user.js/issues/120","id":186197202,"user":{"login":"CHEF-KOCH","id":727123,"avatar_url":"https://avatars.githubusercontent.com/u/727123?v=3","gravatar_id":"","url":"https://api.github.com/users/CHEF-KOCH","html_url":"https://github.com/CHEF-KOCH","followers_url":"https://api.github.com/users/CHEF-KOCH/followers","following_url":"https://api.github.com/users/CHEF-KOCH/following{/other_user}","gists_url":"https://api.github.com/users/CHEF-KOCH/gists{/gist_id}","starred_url":"https://api.github.com/users/CHEF-KOCH/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/CHEF-KOCH/subscriptions","organizations_url":"https://api.github.com/users/CHEF-KOCH/orgs","repos_url":"https://api.github.com/users/CHEF-KOCH/repos","events_url":"https://api.github.com/users/CHEF-KOCH/events{/privacy}","received_events_url":"https://api.github.com/users/CHEF-KOCH/received_events","type":"User","site_admin":false},"created_at":"2016-02-19T12:27:22Z","updated_at":"2016-02-19T12:27:22Z","body":"Correct there is no way because in case Flash placed his cookie the information could directly grab from there together with the 3/4 bits send along with http header. Maybe to fake the header and disallow cookies could reduce this but I think it would break then the page or some functions. "}}