GMail Label Styler is a styler extension for chrome. it's a free extension , it has 80 active users since released its first version, it earns an average rating of 4.40 from 5 rated user, last update is 1649 days ago.
Note: updated for the latest GMail as of 2020-05-11 Enables user to apply CSS to GMail message viewer and editor for selected labels only. Created for mailing list message viewing and editing that works best with monospace fonts but useful in many situations. Configuring CSS properties and one or more label names. Can be used to increase font size in GMail editor without causing the email to be sent in the larger font or even rich text (HTML) format. Only affects your view of the message in the editor, not the recipient.
You could download the latest version crx file or older version files and install it.
English (United States).
33% user give 5-star rating, 33% user give 4-star rating, 33% user give 3-star rating. Read reviews of gmail label styler
You could find more help information from gmail label styler support page.
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The idea is great, but unfortunately not working on new Gmail interface. I make extensive use of labels to track 100s of mails from system health checks. Hopefully someone finds a work around. Paul
Really basic, but also really handy. I'm a system administrator and get a lot of reports with formatted ASCII tables, etc. in my email. This lets me make them properly readable again.
Pretty good if you use filters to autolabel your messages. I have it set up to show various automated reports in monospaced fonts so the columns line up nicely again.