fi is a developer tools chrome extension. it's a free extension and is featured in Developer Tools, it has 85 active users since released its first version, it earns an average rating of 4.50 from 2 rated user, last update is 3302 days ago.
*fi* helps you learn font-family usage in a webpage. Texts inside these elements will be ignored: script, noscript, style, iframe, option. Invisible elements won't be taken into account as well, which includes those with opacity: 0, display: none and visibility: hidden. The result will sort all used font-family values by character numbers they apply to. ie. most used one will be at the top of the result list.
You could download the latest version crx file or older version files and install it.
English.
You could find more help information from fi support page.
You could send emails to publisher, or check publisher's website.
More about manifest_file of fi.
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