Add "Mark All Read" button to GMail is a ads extension for chrome. it's a free extension , it has 543 active users since released its first version, it earns an average rating of 3.15 from 13 rated user, last update is 906 days ago.
The button allows you to change every visible message with an "unread" status to "read" status.
You could download the latest version crx file or older version files and install it.
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You could find more help information from add "mark all read" button to gmail support page.
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Doesn't work; it showed up once, and never again.
I like to use it for my spam folder to keep track of possible false positives. The only problem is that if I started in another folder, I currently have to reload the page to get it to show up in the spam folder. I would give this five stars if, I did not have to do that every time I want to switch to a new folder and still be able to use this button.
In Google Chrome and MS Edge, the button only appears on the 'Inbox' page. Clicking other Gmail menu labels, the button only appears when I reload the page. So clicking 'More' and then 'Mark all as read' is just as many clicks. Pitty it doesn't work as advertised.