[healthysurf]

I made this project a while back which has some alignment with your goals:

https://addons.mozilla.org/en-US/firefox/addon/healthy-surf/

Right now it filters out entire posts on reddit/comments on youtube/sidebar items on Twitter. But I've been meaning to:

1. Expand the sites where it filters, and possibly have it automatically determine which HTML elements to remove instead of me defining it on a per-site basis

2. Make the filter list user-customizable, and change it from static words and phrases to sentiment analysis

3. User-created list of opinions you don't want to read (e.g. any arguments that are anti-nuclear energy/pro-nuclear energy, depending on your perspective). This one is especially important to me because I find contrarian opinions on certain subjects to be both exhausting and boring, and I find myself engaging with them far too often in a "someone is wrong on the internet" sort of way.

I see the value of your request, too. Sometimes it makes sense to see what a consensus is on something, but the language used to dissent can be sort of toxic.