I don't know the answer to your question but the work-around I found was to use an add-on [1] [1] - https://addons.mozilla.org/en-US/firefox/addon/temporary-co

I don't know the answer to your question but the work-around I found was to use an add-on [1] [1] - https://addons.mozilla.org/en-US/firefox/addon/temporary-containers/ https://addons.mozilla.org/en-US/firefox/addon/temporary-con...