I've already spoken about
FFProfile multiple times, but for anyone concerned with how the process works, here's a brief rundown of each page:
NOTE 1: I prefer to skip the Pocket intro as opposed to disabling it entirely, because I do actually use Mozilla Pocket as a means for saving links that I don't want to create a proper bookmark for. If you disabled Pocket and want to re-enable it later, you can toggle the relevant "about

onfig" flag.
NOTE 2: You can also permanently disable autoplay of <video> tags, but I've noticed that it doesn't seem to function any differently from "prompt me," so I opt for that instead.
NOTE 3: If you intend to actually watch HBO Max or Hulu on Firefox, you'll need to untick the DRM stuff. If you have absolutely no need for Widevine or DRM-controlled media playback, keep everything as is.
NOTE 4: Disabling WebGL is the default option. Most people generally don't need WebGL, but I personally like to keep it enabled and have
NoScript toggle WebGL for the few websites I visit that make use of it.
NOTE 5: I leave everything here stock, except for the following settings:
* Enable resistFingerprinting = MAYBE (I like to use it, but it does have a lot of knock-on effects that some people may find baffling at best and irksome at worst;
Privacy Settings is a helpful extension to have if you wish to experiment with this flag without constantly toggling it on/off in about

onfig)
* Enable first party isolation = YES (It allegedly breaks third party logins, but I personally haven't experienced broken logins for Google, Apple, or Facebook). Also, the above Privacy Settings extension exists to toggle this flag on/off too without the need for about

onfig.
* Disable webaudio API = NO (If you like using Discord in your browser or making Teams calls online without relying on the app itself, you need to keep this checked off).
NOTE 6: Nothing special here. HTTPS only mode can always be enabled in about:preferences and almost everything by default (save for shady porn sites) uses HTTPS anyway.
NOTE 7: You have the option of pre-installing extensions in your profile. The only ones worth installing are CanvasBlocker, uBlock Origin, Multi-Account Containers, and
maybe ClearURLs (uBlock handles 90% of the same shit that ClearURLs does, but ClearURLs does a better job of sanitising email tracking links in web mail clients like Gmail). It takes like 15-20 minutes for your extensions to properly sync with Firefox's extension repositories though, so you can also skip this step entirely if you wish to install the latest versions directly via the official add-on site.
Skip enterprise settings entirely, and then download the profile.zip. You will then want to navigate to "about:profiles" in a fresh installation of Firefox, and then create a wholly new profile.
Follow the steps as is, then open the profile you just created in a new file manager window. Make sure all Firefox processes are completely shut down (i.e. pkill firefox on OSX/Linux or Task Manager on Windows). Unzip your profile.zip folder and then copy the entire contents over to the profile directory (making sure to click on "yes replace files" or whatever option that pops up during the copy process).
Congratulations! You just created your own pseudo Arkenfox profile. You'll still need to do some minor cleanup work in "about:preferences" for general stuff, but it's nothing that the average user can't figure out. Attaching sample profile generated for anyone who wishes to fiddle with it.
EDIT: In my own testing with LibreWolf's defaults, this profile is roughly equivalent. There are some really obscure differences that I'm vaguely aware of, but they amount to LibreWolf-specific modifications to browser code. If you have a working Firefox installation, you don't need to jump ship to LibreWolf at all when you can just import a custom prefs.js instead and have 95-99% of the benefits of LibreWolf immediately available to you.