unity-firefox-extension: Unity Integration for Firefox - webaccounts-browser-extension: Ubuntu Online Accounts extension for chromium - webapps-greasemonkey: Firefox extension: Website Integration Details: USN-2743-1 fixed vulnerabilities in Firefox. Future Firefox updates will require all addons be signed and unity-firefox-extension, webapps-greasemonkey and webaccounts-browser-extension will not go through the signing process. Because these addons currently break search engine installations , this update permanently disables the addons by removing them from the system. We apologize for any inconvenience. Original advisory This update provides compatible packages for Firefox 41