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  • Hello

    Would be cool to have Mattermost on sidebar.

  • Does Mattermost have a normal web page that you can load?

    If so, you can add any page you want to the sidebar. Goto the URL opera://flags/#sidebar-site-panel, enable the flag, restart Opera, click the 3 horizontal dots at the bottom of the sidebar, scroll down to "Custom site panels" and add the URL to the Mattermost page.