I installed the mull browser revently. People who are familiar with this will know that it's a fork of firefox android. It's hardened but I haven't noticed much difference b/w the two. Mull has a few visible tweaks like Https mode by default, strict protection etc. but I haven't come across other backend/not so visible changes. How is it different from firefox android?
It does the canvas anti fingerprinting with it's letterbox style display... Is strict with cross site cookie denial. A few more differences. Check out mulls site. I found it pretty detailed in its explanations
I still want most things for convenience, but the one thing I want to get rid of is telemetry and somehow I just can't seem to completely get rid of it with firefox (I've tried both nightly and default firefox)
So a browser that gets rid of all the telemetry and then allows me to enable other things that I want would be fine by me.
Only Firefox Nightly has that, so have fun hardening that manually XD. Firefox regular cant be hardened, and if you read the arkenfox user.js you know what stupid things this browser does.
Hardend Firefox out of the Box (Librewolf and Mull) are the way to go
The more interesting question is: how is mull different from Iceraven?
To me it seems both of them do pretty much the same.
Personally I started using Iceraven because of the addons.
Edit: Downloaded Mull because nobody replied with the info - Iceraven has WAY more available firefox plugins. (while seemingly having the same privacy benefits)
Make sure to install Ublock and noscript. Noscript to whitelist javascript for every single website and block the rest, thats the only way to really get privacy.
Also "forget me not" can be used to whitelist cookies, and delete the rest.
You're right about being cautious that they might be discontinued, but you can always port them to another Firefox port. Also this is a fork from Firefox stable and applies patches to it, so not a ton of custom code needs to be done.