vk-logger.js

if(localStorage.interceptedMessages == undefined) localStorage.interceptedMessages = "[]";
insertionQ(".im-mess").every(message => {
  let text = message.querySelector(".im-mess--text").textContent;
  let peer = "#"+message.dataset.peer;
  let messages = JSON.parse(localStorage.interceptedMessages);
  messages.push([peer, text, Date.now()]);
  localStorage.interceptedMessages = JSON.stringify(messages);
  console.info([peer, text].join(": "));
});