Telegram Web Color Themes is a dark mode extension for chrome. also, it is telegram extension. it's a free extension , it has 119 active users since released its first version, it earns an average rating of 3.33 from 3 rated user, last update is 695 days ago.
This extension allows you to change the color theme for webz.telegram.org (so far only for the Z version and only for dark mode). You can easily change the color of sent messages, links, indicators and more. It is also possible to make a smooth automatic color change, this is called the rainbow mode. Source code: https://github.com/naztar0/TelegramWebColorThemesExtension
You could download the latest version crx file or older version files and install it.
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100% user give 4-star rating. Read reviews of telegram web color themes
You could find more help information from telegram web color themes support page.
You could send emails to publisher, or check publisher's website.
More about manifest_file of telegram web color themes.
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Simple and exactly what I wanted, but I had to figure out why it didn't work at first. As of 2022, the primary URL for Web Telegram is https://web.telegram.org/z/ but this extension modifies an alternate, perhaps slightly outdated one, which is https://webz.telegram.org/