async initialize()

in src/js/popup.js [1973:2027]
47 lines of code
6 McCabe index (conditional complexity)

  async initialize() {
    this._proxyForm = document.querySelector(".advanced-proxy-panel-content");
    this._advancedProxyInput = this._proxyForm.querySelector("#edit-advanced-proxy-input");
    const clearAdvancedProxyInput = this._proxyForm.querySelector("#clear-advanced-proxy-input");
    this._submitadvancedProxy = this._proxyForm.querySelector("#submit-advanced-proxy");

    this._advancedProxyInput.addEventListener("keydown", (e) => {
      if (e.key !== "Enter") {
        this.hideInvalidEntryWarning();
      }
    });

    this._submitadvancedProxy.addEventListener("click", (e) => {
      e.preventDefault();
      this.submitProxyForm();
    });

    clearAdvancedProxyInput.addEventListener("click", (e) => {
      e.preventDefault();

      const activeEl = document.activeElement;
      if (activeEl === this._advancedProxyInput) {
        return this.submitProxyForm();
      }
      if (activeEl !== clearAdvancedProxyInput) {
        return;
      }
      this.hideInvalidEntryWarning();
      this._advancedProxyInput.value = "";
      this._advancedProxyInput.focus();
    });

    this._advancedProxyInput.addEventListener("blur", () => {
      if (this._advancedProxyInput.value.length === 0) {
        return;
      }
      if(!proxifiedContainers.parseProxy(this._advancedProxyInput.value)) {
        this.showInvalidEntryWarning();
      }
    });

    this._advancedProxyInput.addEventListener("focus", () => {
      this.hideInvalidEntryWarning();
    });

    const returnButton = document.getElementById("advanced-proxy-settings-return");
    Utils.addEnterHandler(returnButton, () => {
      return Logic.showPanel(P_CONTAINER_EDIT, Logic.currentIdentity(), false, false);
    });

    const learnMoreButton = document.getElementById("advanced-proxy-settings-learn-more");
    Utils.addEnterHandler(learnMoreButton, () => {
      browser.tabs.create({ url: "https://support.mozilla.org/kb/containers" });
    });
  },