A userscript to blur all tweets on Tweetdeck, then selectively unblur those that DON'T talk about the pandemic as you hover over them.

safety-dance.js

// ==UserScript==
// @name         Safety Dance
// @namespace    http://catherinewinters.com/
// @version      0.1
// @description  Take a breath from The Problem. It's okay to prioritize your mental health.
// @author       Catherine Winters
// @match        https://tweetdeck.twitter.com/
// @require      https://code.jquery.com/jquery-1.12.4.min.js
// @grant        none
// ==/UserScript==

(function ($, undefined) {
  $(function () {

      const substrings = ["covid","corona","virus",
                          "trump","cuomo","biden","glenn beck","president","liberal","coulter","governor","trudeau","administration",
                          "reopenamerica",
                          "bonnie henry","rent freeze",
                          "death","murder","killed","sick","people's lives",
                          "trolley","toilet paper","stonks",
                          "apocalypse","aids","end times",
                          "glove","n95","mask","hospital","pharma","vaccine","testing","medication","healthcare","icu","ppe",
                          "cruise",
                          "dow","stock market","stocks","markets","the economy","slavery","libertarian","economic",
                          "boeing","disney",
                          "epidemiolog","fatalities","evicted","laid off","layoffs","unemployed",
                          "lifesaving","social distancing","save lives","hand wash","wash your hand","wash hand","quarantine"];
      // Setup
      console.log("Substrings: " + substrings.join(","));

      $('body').append('<style>.js-tweet { filter: blur(4px); } .js-tweet-unblurred { filter: blur(0); } </style>');

      $(document).on({
        mouseenter: function () {
            //stuff to do on mouse enter
            var text_to_search = $(this).text().toLowerCase();
            if (!substrings.some(v => text_to_search.includes(v))) {
               console.log($(this).text());
               $(this).addClass('js-tweet-unblurred');
            }

        },
        mouseleave: function () {
            //stuff to do on mouse leave
        }
    }, ".js-tweet"); //pass the element as an argument to .on
  });
})(window.jQuery.noConflict(true));