Created COVID_RAINBOW Extension

Extension/COVID_RAINBOW/manifest.json

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+{
+    "manifest_version" :2,
+    "name" : "Coronavirus Immunity",
+    "version": "0.1.0",
+    "content_scripts": [
+        {
+            "matches": ["<all_urls>"],
+            "js": ["script.js"],
+            "css":["styles.css"]
+        }
+    ]
+}

Extension/COVID_RAINBOW/script.js

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+replaceText(document.body)
+
+
+function replaceText(element){ 
+    if(element.hasChildNodes()){
+        element.childNodes.forEach(replaceText)
+    }
+    else if(element.nodeType == Text.TEXT_NODE){
+        if(element.textContent.match(/coronavirus/gi))
+        {
+            const newElement  = document.createElement('span')
+            newElement.innerHTML = element.textContent.replace(/(coronavirus)/gi,'<span class="rainbow">$1</span>')
+            element.replaceWith(newElement)
+        }
+    }
+}

Extension/COVID_RAINBOW/styles.css

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+.rainbow {
+    animation : rainbow 600ms;
+    animation-iteration-count: infinite;
+
+}
+
+@keyframes rainbow {
+
+    0%{
+        color: red;
+    }
+    15%{
+        color: orange;
+    }
+    30%{
+        color: yellow;
+    }
+    45%{
+        color: green;
+    }
+    60%{
+        color: blue;
+    }
+    75%{
+        color:indigo;
+    }
+    90%{
+        color: violet;
+    }
+}