The beta versions are completely supoprted for 3 months, after that they won't be recieving updates, but then there will be updates for the major v1.xxx versions, they will start at v1.0, then minor versions will be placed below the decimal (e.g 1.1 and then 1.11 etc), it will be up to you, unless implemented later, to keep your browser up to date, keep checking on the GitHub to see if there is an update.
Please report a potential or vunerability on our software via the 'Issues' tab.