message: write errors to stderr
diff: @@ -67,7 +67,7 @@ function openPage() {
  });
  }).then(passWindowId)
  .catch(function(e) {
  - console.log(e);
  + console.error(e);
  });
  browser.contextMenus.create({
  @@ -118,7 +118,7 @@ function disconnectAllTabs(tabs) {
  }
  function queryError(error) {
  - console.log(`Error: ${error}`);
  + console.error(`Error: ${error}`);
  }
  browser.windows.onRemoved.addListener(function(windowId) {
  