Yes, we plan to keep the Firefox APT repository enabled in Zorin OS 17.3 by default during this transition period, in case someone still wishes to install the same Firefox package we included previously.
Moving default browsers is a major change, so we want this transition to be as smooth as possible for all users, including those who want access to the same browsing experience as before.
In future major releases of Zorin OS, you'll be able to add the Firefox APT repository to your system by following these instructions: