A disaster in every respect! The homepage of the expansion reveals the truth. The link to the developer's homepage leads to a page with casino games. This expansion in no way deserves the minimum rating of one star. And by the way, Firefox shows it as "Blurred Tab" with completely other features than described hear.

This is a scam. it installs other add-on Blured tabs. and the developer is a gambling site. kind of games.

Instals wrong extensin

Adds 'blurred tab', which does nothing

When initiating the installation, Smart Tab Sorter instead offers to install another extension named "BlurredTab".