why dont you remove firefox and install another one?
firefox is open source but not the company that making it
so i sugest you to uninstall firefox and install something else
i personaly use vivaldi and falkon
if u want a lightweight browser go for falkon
if not then go for vivaldi
and for searchengine i think duckduckgo its a good one
ive been using internet explorer on win xp for quite some time
it dont mean that i shouldnt use vivaldi on manjaro or i shouldnt have come from win to debian and from debian to arch
(i dont know what they will do with this but its looks like collecting data to me)
i dont read the post personaly but they are saying that because we dont like someone or someone doing
we should or we will cut the access of that person to our product and that include the open source firefox
i dont like what those people were doing but thats another matter
open source means that everyone can use the product for what purpose they want
there is some but in it like if they improve it they should send the source back (gplv2) or they shouldnt use it for making money or
i think more than half of the browser that i know is using qtwebengine
so they are chrome clones
i think this will be a good one when its published
vivaldi is not completly open source there is some property code/product in it i think
well its retreivng from bing,yahoo,google and yandex
but they dont collect your data (they say we dont do it but i dont know if they realy dont do it)
/.mozilla/firefox/iy5pkeh5.default-1570610636384/addons.json:Yahoo Search Addon
/.mozilla/firefox/iy5pkeh5.default-1570610636384/addons.json:Evening at the Carnival
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For the temes, the best should be to only keep the one you use, but I have no clues on their possible breakage.
For the search engine, if you really want to keep it, try to get rid of the add on and to replace with yahoo from https://mycroftproject.com/
I really advize you to add ublock origin, LocalCDN and Site Bleacher to your add ons.
Country Flags & IP Whois is another interesting one.
For the email address flee any large free provider (the best is to host your mails on your own domaine, cost starts @ $3/month