But that post is Mozilla clearly speaking out against SREN because they do not want to be compelled to block certain sites.
Are you then talking about Google Safe Browsing? Which is enabled by default in Firefox, but which does not "monitor your activities". It compares the site you are about to visit to a downloaded list of known bad ones and warns you if it's on the list. Hardly an Orwellian nightmare. Just turn it off or ignore the warning if you do not want it. I keep it on because I've never seen a false positive on that list and I understand that even I'm vulnerable to attack.
We should be free to customize programs, free to block what we don’t need
And you are. If you don't want to use safe browsing, turn it off, is right there in the menu. They have given you a default that's best for most people and the option to customize.
Further, since it's free software there's really no limit to your power to customize or get rid of what you don't need. (I understand that this is not possible for most people, but that's why you have the menu options, this is just a final line of defense.)
I'd say it's more that peaceful protest and violent protest are symbiotic. Peaceful movements attract broad support, and ensure you can not easily be dismissed as extremists and violently suppressed. Violent protest show that you can not be ignored without consequence.
The idea that they are at odds is harmful.