Ok, this worked perfectly for Chrome and Vivaldi, but not so much for Firefox. I updated the three using the updating tool for the browsers, and also checking the procedure detailed here:
You don't need to rebuild your ISO to use it just put the new firefox module in your modules folder and reboot. All your bookmarks and setting should be there.
How to update Firefox
Which is what I did, however, Firefox customizations are now gone. These were only preserved for Chrome and Vivaldi.
As a note, I did not use the Firefox version from the server, but the current version, which I the updater downloaded and converted to a module, to be placed later in the modules folder. No idea what I'm doing wrong here.