Switching from Firefox to Librewolf has some pros and cons. Librewolf is a fork of Firefox focused on privacy and security, with telemetry stripped out and privacy settings maxed out by default. You'll gain better out-of-the-box privacy protections, meaning less tracking and data collection without having to tweak settings yourself.
However, you might lose some convenience. Librewolf might not support certain Firefox features like Sync, since it relies on Mozilla's servers (not sure about that point, maybe it does work). It can also break some websites due to the stricter privacy settings. Another thing to consider is that you won't get updates as quickly as Firefox.
Regarding browser fingerprinting, it's a tricky beast. Librewolf can help somewhat by making your fingerprint less unique, but it's not a silver bullet. Tools like uBlock Origin and container tabs are great, but adding something like the CanvasBlocker extension can also help reduce fingerprinting. Ultimately, no setup is perfect, but Librewolf is a solid step towards better privacy.
My two use cases are project brainstorming and boilerplate code, which saves a lot of time for me. For example sometimes I find an interesting paper and want to try it out in Python. If they did not provide code that will take some time and trial and error to get it running. Or I just copy the whole paper into ChatGPT and get an initial script that sometimes even works with it's first try. But that is not the point, I can do the last steps myself, it really is a time saver for me with regards to programming.