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Actually I'm not. That's why I'm asking, to not to miss this basic stuff, so I really appreciate your advice. Thank you!

If I get your question correctly, you are asking why this extension is need for?

Well, 2 main aims:

1. When I want to check any of pages on my own websites, I just visit the page and see if it's ok with all the robots stuff. (or if it should be closed from robots, see if it really is)

2. For linkbuilding purposes. When I come to the page and see a link from it to external website and I know for sure that I can get the same link to my site, I'm asking myself, if it worth getting link from the page like this, if it's gonna be indexed. Why waste your time on getting links from pages that are closed from indexation.

With "site:site.com" you can only see if the page is indexED, but to know if it's indexABLE you need to dig deeper. That is why I've decided to automate this process.

As I already told, this gonna be a browser extension, once you got on any page, this ext. automatically checks the page, and show the status (with color, I guess), if this page indexed, if not - it shows if its indexABLE. When I'm looking for linkbuilding resources, this little tool should help a lot