# \[Support\] uMatrix

**URL:** <https://discourse.mozilla.org/t/support-umatrix/5131>\
**Category:** Add-on Support\
**Created:** [November 6, 2015, 2:21am UTC](https://discourse.mozilla.org/t/support-umatrix/5131 "2015-11-06T02:21:34Z")\
**Posts on this page:** 1\
**Showing post:** 18

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**Author:** ![gorhill](https://avatars.discourse-cdn.com/v4/letter/g/c5a1d2/32.png) [@gorhill](https://discourse.mozilla.org/u/gorhill)\
**Post date:** [June 23, 2016, 1:56pm UTC](https://discourse.mozilla.org/t/support-umatrix/5131/18 "2016-06-23T13:56:06Z")

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> [@rvb](#):
>
> I have not had any success finding an explanation of the red & green triangles that appear in the top left corner of some of the rows.

[The matrix cells](https://github.com/gorhill/httpswitchboard/wiki/The-matrix-cells).

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