Mozilla Firefox and Opera released new versions of their web browsers last week to introduce new security features and patch a number of vulnerabilities.

Firefox version 12 plugs 14 holes, seven of which were deemed critical. The fresh installment also comes outfitted with a more seamless update process including background updates, ending the need for users to manually approve fixes each time they are released – a time-consuming process.

“We put a lot of work into making the Firefox update experience easier. Firefox simplifies the update process for Windows users by removing the user account control dialogue (UAC) pop-up while maintaining the security of your system. Once a user gives explicit permission to Firefox on their first installation, they will not be prompted again for subsequent releases,” it said.

Opera released the beta version of its own version 12. Codenamed ‘Wahoo', it said that one of the key inclusions is support for a do-not-track header, which acts to prevent websites from tracking users. The capability currently exists in all of the major browsers except Chrome.