µMatrix do not guarantee sites will work fine: it is for advanced users who can figure how to unbreak sites, because essentially µMatrix is a firewall which works in block-all/allow-exceptionally mode out of the box: it not unexpected sites will break.
**So this means do not file issues to report broken sites when the sites are broken because µMatrix does its job as expected.** I will close any such issue without further comment.
I expect there will be community driven efforts for users to help each others.
µMatrix can be set to work in allow-all/block-exceptionally mode with a single click on the `all` cell in the global scope `*`, if you prefer to work this way. This will of course break less sites, but than you would lose all the benefit which comes with block-all/allow-exceptionally mode.
