Found some Firefox forks but can't decide which one to use

Zen will give you the most functionality. Librewolf will give you the most privacy and security.

Tor Browser will give you most privacy and security, but it can be considered overkill for everyday use. Librewolf takes second place.
- Well. I don't really think of TOR as a browser but I digress.

Zen browser was my favourite but this put me off:

https://sizeof.cat/post/web-browser-telemetry-2025-edition/

I'm pretty sure that they removed a lot of the telemetry in a very recent update, so I'm not sure how it stacks up now.

Librewolf.

I'm using Waterfox. Been great so far.

I just started using it myself. I can't see a difference between it and Firefox, which is a good thing because it means sites aren't breaking. But it also makes me wonder just how much more private it is.

I've been trained by experience that privacy is strongly correlated to web sites not working properly.
- As far as I know, the only thing Waterfox does (differently from Firefox) is not collecting telemetry and having uBlock Origin installed by default. I haven't noticed sites breaking either (at least, any more than they did on FF).
- +1 for Waterfox, for some reason it works 100% of the time on my usual websites, whereas Librefox has quirks or just fail (because DRM for what I understand)
  
  Plus it seems Waterfox is a bit more professionaly build and maintained, the team do tell you how they make money from side projects like searches, that is not in the browser core, good enough for me.

I use Librewolf as my daily driver for most things, then Mulvad when I don't want any fingerprinting.

Mulvad is highly underated IMO.

Mullvad Browser isn't bullet proof, it will not prevent fingerprinting entirely, though it makes it less reliable, especially if it isn't sophisticated.

Mullvad browser is also another great Privacy web browser but probably be more suited if you have a active subscription to mullvad VPN since it's point is to blend in with other mullvad VPN users.

I was using (and really liked) Librewolf until I heard that they were having trouble keeping up with Firefox updates. Now I'm using the Phonenix configurations for Firefox and keeping the FF updates separate from the privacy configuration settings. Avoiding forks lets you get the best of both worlds.

https://github.com/celenityy/Phoenix https://codeberg.org/celenity/Phoenix/wiki/Comparison

I've been using Zen and Librewolf, I recommend both of them but Librewolf will give you the privacy out of the box. A friend of mine uses Floorp and he seems happy with it.

In terms of use, librewolf feels exactly the same as firefox. I chose librewolf but zen is my 2nd pick try them both.

I use librewolf and arkenfox

What would be a good option for the iPhone environment (changing phones not an option)? There are four different Tor browser apps from different developers. Using DuckDuckGo right now, but any other better options?

Onion browser from Mike Tigas was recommended as alternative to official one for iPhone by developers. For normal browsers you currently have Firefox, Firefox focus and Orion from kagi. Those options are safest ones from what I know on iPhone
- Thanks, looks like the Onion from MT has quite bad reviews. Hmm.

Anyone know of a desktop equivalent to IronFox?

prob librewolf i use ironfox on mobile and librewolf on my pc and its very similar
- I meant more on the security front than UI, but Librewolf does mention "security" 5 times on their page so I guess they are probably more secure than base FireFox.

If you're a really "mainstream" user not really caring about privacy and such use Floorp or Zen.

If you're caring about privacy at least a bit and want to get a pleasing experience, use Waterfox.

If you're a bit more serious about privacy use Librewolf (mainly for privacy itself) or Mullgad Browser (for anonymity and fingerprinting). (These browsers are totally usable if you care about privacy and can be 100% used as daily drivers)

Lastly, you shouldn't use Tor Browser in replacement of the traditional Firefox as it's firstly meant to use it with the Tor network and to only browse some sites that are not tracking every move. (The same goes a bit with Mullvad (excepting the fact that Mullvad is not meant to browser the Tor network), it's an anonymity browser in the sense that you shouldn't use it to connect to the GAFAM fucking services that will suck 100% your datas, in this case of high privacy without really needing pure anti-fingerprinting and anonymity you should use Librewolf)

That's it hope you will succeed in your journey! :)

Last advice : You can also harden the default Firefox with some user.js (like the arkenfox or betterfox one) but as today it's really no more useful in my opinion as forks are doing the same things without the configuration hassle of setting up your new browser. Have a nice day

I've been using Floorp for a few months and it's been as easy as possible to replace Firefox.

Floorp

I use FireDragon. Not on your list, but it's yet another Firefox fork to look at.