For this extension to be useful DeepL really needs to allow full webpage translations for free or for a cheaper tier. Right now its close to $100/yr for access to full website translations. For now all you can do is select sections of text and translate. The translation process is slower than other options that are available. It does really well with longer form text but can struggle with shorter texts, names, titles, idioms, etc.

Overall from the perspective of someone who is only interested in translating websites for personal web browsing this extension does not provide much functionality beyond the translation website.