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I’d recommend checking out Distrobox, which allows you to create containers of other Linux distros then export their applications as if they were native. Install a distrobox with one of the distros that this program works with, use the terminal to install the program within it, then if it isn’t immediately in your applications menu use the distrobox export feature to place it there.
You could also layer Nix onto your bazzite image and install it that way, but if you don’t know Nix it’ll be complicated
Mostly LibreWolf, but I’ve been enjoying Zen Browser recently. It’s based on Firefox but with lots of cool extra functionality baked in. It is still in alpha though and I’ve experienced some bugs, including it crashing my whole system a couple of times, but it’s very promising