Just updated to 2.53.1 and was testing some toolbar buttons and there's one I use that isn't working for me -- the Menu button.
You can find this button on the custom toolbar button maker site -- https://codefisher.org/toolbar_button/t ... -US/suite/. It's the second-to-last button on the left side.
The button shows up in the toolbar, but clicking on it does nothing. I'm also unable to select items in the extension's Options menu.