Unfortunately, web browsers are one of the few applications where "keep the current version" is not a viable option. Web browsers are very exposed to every web site they visit (including code injected by ad networks), and once a new version is released, many serious vulnerabilities on the previous version are revealed (for instance, https://www.mozilla.org/en-US/security/known-vulnerabilities... is the list for Firefox). Keeping an old version can be a serious security risk.

I put the odds of that somewhere around the same as the odds that GNOME Screensaver will ever support any of the xscreensaver demos it claimed it would … which is to say, I'm not holding my breath.