add some helpful comments

scripts/hide-slop.js

@@ -21,6 +21,7 @@ function check_links(links) {
 }
 
 async function message_listener(message) {
+    // handle slop reports returned from the background script
     if(message.type === "check_result") {
         console.log(message.url, message.result)
         page_links.get(message.url).result = message.result
@@ -28,7 +29,7 @@ async function message_listener(message) {
 }
 
 function get_initial_links() {
-    //get links
+    // get links from initial page load
     const links = document.querySelectorAll(ddg_result_selector)
     links.forEach((node) => {
         const link = new SearchLink(node)
@@ -54,21 +55,24 @@ function update_links() {
 }
 
 function setup_result_observer() {
+    // observe changes in the result list to respond to newly loaded results
     const config = { childList: true }
     result_list_observer = new MutationObserver(update_links)
     result_list_observer.observe(result_list_node, config)
 }
 
 function onload_handler() {
-    // get results ol node
+    // get results ol node to observe
     result_list_node = document.querySelector(ddg_result_list_selector)
 
     get_initial_links()
     setup_result_observer()
 }
 
+// listen for messages from the background script
 browser.runtime.onMessage.addListener(message_listener)
 
+// initialize state on document load
 if (document.readyState === "loading") {
     document.addEventListener("DOMContentLoaded", onload_handler)
 } else {