agreed that they should open the source. I imagine it's a pretty simple app. a mapping of css selectors with a single line that runs on page load, something like this:

    document.querySelectorAll(css_selector).remove()

the hard part would be maintaining the css selectors. This is probably and arms race situation, where websites will obfuscate their elements in such a way where identifying the elements you want is nigh impossible, but that would probably take more engineering than it's worth. What's really interesting is that facebook does not scrub their `data-testid` attributes, so you can basically key on that since they probably test that part of the application extensively, and probably run smoke tests/chaos engineering on their live app so removing them might be impossible in their current implementation.

right now on facebook the appropriate js code would be:

    document.querySelectorAll('*[data-testid="fbFeedStoryUFI/feedbackSummary"]').forEach(element => element.remove())