To use these add-ons, you'll need to download Firefox.

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Live editor for CSS, Less & Sass - Magic CSS sɣur webextensions.org

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The features can work fine with Firefox 55 onwards for Android. It requires some "browserAction" API which would apparently become available by that version. But, some other API implementation is still slightly incomplete.

Till then, one may make a custom build from firefox-android branch of the project, available at:
https://github.com/webextensions/live-css-editor/tree/firefox-android