Add social blocking toggle for YouTube embeds

[tildelowengrimm]

Along with the other social media blocking features, add an off-by-default option to block YouTube embeds.

[ryanbr]

I'd expect people submitting false positives, i.e forgetting this was enabled and then complaining issues of youtube issues.

[ryanbr]

One would also argue, why not other embedded video sources also? or are we specifically picking on youtube? anyway, my thoughts :)

[fmarier]

I added YouTube embeds on my test page: https://fmarier.github.io/brave-testing/social-widgets.html

[tildelowengrimm]

@ryanbr Your point about other embeds is well-taken. We'd like to make it easy to control whatever cross-site activity you'd like to limit. But you're far more likely to stumble over a YouTube embed than any other, so it makes sense to build that control first.

[fmarier]

The new Firefox "Social Tracking Protection" feature is now enabled by default in Nightly:

and blocks Facebook, LinkedIn, Twitter and YouTube.

[ryanbr]

Something like this:

[*]  Ads
     [ ] First party ads  (https://easylist.to/easylist/easylist.txt)

[*] Tracking              (https://easylist.to/easylist/easyprivacy.txt)
    [ ] First party Tracking
    [ ] Coin mining
    [ ] 3rd-party Font Tracking 

[*] Social Filters        (https://easylist-downloads.adblockplus.org/fanboy-social.txt)
    [ ] Strict blocking of social domains

[*] Web Annoyances        (https://easylist-downloads.adblockplus.org/fanboy-annoyance.txt)

[*] Cookie Filters        (https://fanboy.co.nz/fanboy-cookiemonster.txt)

We support all of these lists in Easylist / Easylist authors.

[fmarier]

This will likely be a similar PR to https://github.com/brave/brave-core/pull/3784.

[iefremov]

+1 for covering other video sources along with YouTube - this can possibly fix https://github.com/brave/adblock-lists/pull/275