Librewolf is a fork of Firefox, is friendly to set up and comes with Ublock Origin already installed. Librewolf can use all the same extensions/addons that are available for Firefox.
Tested in FatDog64-903 only. May work in other 64-bit OS but not tested.
This runs as user spot. I removed the control file and added "run-as-spot" to the librewolf.desktop file Exec= lines. Nothing else.
Download from this page, about 83MB
https://www.mediafire.com/file/wh2gcrsb ... 4.sfs/file
md5 checksum f46e619b64630e171c1a706680c68e05
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The package I used to build the sfs was named librewolf_132.0.1-1_amd64.deb and was sourced from here.
ftp://ftp.home.vim.org/vol/5/ufficiozer ... librewolf/
The binaries of the above .deb package originate from the librewolf-132.0.1-1-linux-x86_64-package.tar.bz2 (latest binary release) from the archlinux page that hosts the latest librewolf binaries at https://aur.archlinux.org/packages/librewolf-bin
It kind of surprised me they were compatible with FatDog64-903 
It also provides us a source for the latest Librewolf 64-bit binaries when they are released.
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A nice side by side privacy comparison of many browsers shows how Librewolf compares with the other security-oriented browsers.
https://privacytests.org/