feature: chain-block/mute only protected accounts from follower's list

[SatrioKamaludin]

The title itself is self-explanatory

Case-scenario: I found a tweet that has 6 likes, but when I run the extension, in only blocks/mutes 4 users. Which means there are 2 protected/privated users which does not count into. It's understandable given user's limited access of viewing protected users just from tweet's likes.

So I come up with the suggestion of features that by only chain-blocking/muting protected/privated accounts from user's following list as an alternative workaround since all followers from public twitter user are visible including privated ones. Currently the feature only works for my twitter's followers but not another visible user's followers.