45to75 is a developer tools chrome extension. it's a free extension and is featured in Developer Tools, it has 1,000+ active users since released its first version, it earns an average rating of 4.67 from 6 rated user, last update is 3556 days ago.
Helps designers and developers ensure that text line lengths (measure) meet their standards. Each font and layout is unique, so it's up to the author to decide what measure works for their current situation, however a good "rule of thumb" is to keep the measure between 45 and 75 characters. This will ensure your text stays readable across the various situations in which it could be read. Highlight some text, right click, and view the character count right in the tooltip.
You could download the latest version crx file or older version files and install it.
English.
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I've seen another similar extension. This one doesn't give you any options so the title seems somewhat meaningless.