Oh, this is what you are asking. Yes, it is outdated currently, but our dev is working on it.
First of all, I don’t recommend Firefox at all, unless you are interested enough to “tune it” for privacy. Look at this, for example: Making sure you're not a bot!
Second, sometimes out of the repo (3rd party package) install may not work because of the unmet dependencies and it will cause you just a headache.
Our PureBrowser is outdated, but recently we have two new Debian developers joined to our team, they started working on PureBrowser and other packages to bring them up to date.