uBlock-LLC
Can't block ember IDs
Upon trying to hide blocks like ###ember<ID> I realized this never works. You can try ###ember1750-trigger at https://www.linkedin.com/feed/ which corresponds to the Sort by block for the feed.
I did experience the same issue on many different sites so I wonder if it's simply the Ember JS framework block elements not being able to be filtered out by uBlock?
Those IDs are generated on the fly by Ember and aren't likely to be the same between sessions. You may want to try a class-based selector instead.
I've been trying to experiment with class-based selectors but wasn't entirely successful. ##[id^="ember"] is interesting (didn't actually know regex was supported!) though it can be a nuclear option that will block (potentially) all elements on a page. Try on Linkedin for instance.
https://discourse.mozilla.org/t/support-ublock-origin/6746/57 says you can't specify N number of characters either, which is annoying if you'd like to block, say, only ##ember3274