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Google pulls the plug on uBlock Origin, leaving over 30 million Chrome users susceptible to intrusive ads
(www.windowscentral.com)
This is a most excellent place for technology news and articles.
I think what you want is in Firefox nightly right now: https://blog.nightly.mozilla.org/2024/08/07/firefox-sidebar-and-vertical-tabs-try-them-out-in-nightly-firefox-labs-131/
That expands and compacts based on the sidebar state and can be flipped to the right side of the window in the 'customise sidebar' settings.