This is the main thing that's keeping me from using Chrome more often - apparently the extensions cannot modify the UI of the browser, which means I lose a lot

This is the main thing that's keeping me from using Chrome more often - apparently the extensions cannot modify the UI of the browser, which means I lose a lot of customizations. For eg., an extension like Tree Style Tab (https://addons.mozilla.org/en-US/firefox/addon/tree-style-tab/ https://addons.mozilla.org/en-US/firefox/addon/tree-style-ta...) is apparently not even possible.