#Klar is set as the default browser, so that opening links from other apps does not pollute my #Fennec tabs.
https://f-droid.org/app/org.mozilla.klar
And on #Fennec I have set the reset on quit option and installed #ublockorigin, same as on my desktops.
https://f-droid.org/app/org.mozilla.fennec_fdroid