The extension icon - uBlockOrigin/uMatrix-issues GitHub Wiki

The extension icon in the toolbar gives an overview of how uMatrix affected a page:

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The red and green areas provide a rough overview of how many resources were blocked (reddish) versus how many resources were not blocked (greenish).[1]

The badge number tells the number of resources which were blocked/modified. This number will typically match what is reported in uMatrix's logger.

You can turn off the badge number in the Settings pane in uMatrix's dashboard.

[1] Keep in mind that "resources blocked" is a generic expression which includes removal/modifcation of response and request headers.

uMatrix: Point and click matrix to filter net requests according to source, destination and type.

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