chrome.runtime.onInstalled.addListener(() => {
    chrome.storage.local.get("replacements", (data) => {
      if (!data.replacements) {
        fetch(chrome.runtime.getURL("replacements.json"))
          .then((response) => response.json())
          .then((json) => {
            chrome.storage.local.set({ replacements: json });
          });
      }
    });
  });