I'm not in the US neither US politics affect me, but this kind of agenda on Mozilla official pages is the reason why more neutral community and OSS projects thrive and Firefox see it's decline. CEO of Mozilla can have whatever political position he wants to, but browser suppose to be a dumb pipe just like ISP is. It's just outrageous how someone stand against ISPs control of internet and support net neutrality with one hand, but with other hand push his agenda via non-profit corporation resources.
Just imagine Blender Foundation or GIMP making statements about how we need a tools to control whatever 3D models people able to work on because you know you can create some fake child pornography using them.
Or might be Apache or Linux Foundation management would say how we need to track all possible malicious actors who can run some botnet / CNC software using their products. This would be totally dystopian, isn't it?
Did you even read the title? It advocates for drowning out opposition based on what they believe "is true". Everyone thinks they are right. If you don't respect the right of those you disagree with to speak, functionally, you don't respect any freedom of speech.
Amplifying content in algorithmic news feeds is hardly censorship. Anything Facebook did would be counter to the usual forces that amply divisive (engaging) content.