How can I mark a website as read?
Recently in need of this functionality yet again and with no solution matching my needs in sight, I decided to delve into the docs and solve my own problem.
Mark as Read (Google Chrome Extension)
Allows the user to tick off a website by clicking on the extension icon.
If the page is unchecked it will look like this:
If the page is checked it will look like this:
If you want to contribute or suggest changes, feel free to do so at the GitHub repo.
Use FirstVisit extension
- Download it from my GitHub https://github.com/cyclopentan/cyclopentan.github.io/tree/master/firstVisit
- Choose any folder to install in, then unpack it
- Go to chrome://extensions/
- Enable developer mode
- Click to "Upload unpacked extension"
- Select folder
If you visited this page it will look like this
If not, like this 
Full disclosure: I am the author of this plugin.