Toggle show or hide Slack's channel sidebar
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Google Chrome
https://chrome.google.com/webstore/detail/slack-toggle-sidebar/falbhdlejfolflphlfnkkpdmialebkdl -
Mozilla Firefox
https://addons.mozilla.org/en-US/firefox/addon/slack-toggle-sidebar -
Microsoft Edge
Waiting for review -
Opera
https://addons.opera.com/en/extensions/details/slack-toggle-sidebar