chrome: Manifest version 2 is deprecated, and support will be removed in 2023

More details about the chrome developer transition here.
{"name":"The Stream Detector","description":"__MSG_extText__","manifest_version":2,"default_locale":"en","permissions":["<all_urls>","clipboardWrite","downloads","notifications","storage","tabs","webRequest"],"background":{"page":"background.html"},"icons":{"16":"img/icon-dark-16.png","48":"img/icon-dark-48.png","96":"img/icon-dark-96.png"},"commands":{"open-popup":{"description":"__MSG_openPopup__"}},"options_ui":{"browser_style":true,"chrome_style":true,"open_in_tab":false,"page":"options.html"},"browser_action":{"browser_style":true,"chrome_style":true,"default_title":"The Stream Detector","default_popup":"popup.html","default_icon":{"16":"img/icon-dark-16.png","48":"img/icon-dark-48.png"},"theme_icons":[{"dark":"img/icon-dark-96.png","light":"img/icon-light-96.png","size":96},{"dark":"img/icon-dark-48.png","light":"img/icon-light-48.png","size":48},{"dark":"img/icon-dark-16.png","light":"img/icon-light-16.png","size":16}]},"version":"2.10.6"}

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I'm aware. I'll move to v3 once v2 becomes fully obsolete in Firefox.