I would like to see what the highest ranking keyword actually is - not just a number in the top 100

Show how much traffic it has per top 3 countries

like moz bar for DA but for your metrics

On-Page Checker like SEO Minion tool bar have mixed with the YoastSEO real content analysis with a keyword placement checker/counter and METAS reviewer. Yes, that's all.

Top rankings keywords number with mentioning of top 5 keywords names. I think this you can do in a free version.

It's useful to set a custom header when browsing a website, e.g. a website that respects accept-language will need a blank value sent to see what Googlebot would see. I currently use https://modheader.com/ extension to achieve the same. Would be nice to have fewer extensions.

It'd be great if in the on page SEO data we could quickly see if a page has structured data or schema.

Basically exactly what Moz has in the chrome tool bar where you punch in a KW and it gives you a score and on-page suggestions to fix.

Ahrefs Toolbar could show keyword suggestions for the search query in the SERP directly.

Your extension is helpful for finding backlinks, but it would make things even faster if I could have it only highlight external backlinks to a specific domain or URL I'm building links to.