Open a blocked page anyway

[jtagcat]

Is your feature request related to a problem? Please describe.

moz-extension://7297fed8-44a7-4dff-8e13-b0e4ec88b54d/main-blocked.html

uMatrix has prevented the following page from loading:
...
Close

There is no way to open the page, without using an another profile, or disabling nuTensor.

Describe the solution you'd like
As with uBlock, 'allow once', 'allow always'

[gwarser]

https://github.com/gorhill/uMatrix/wiki/How-to-have-root-documents-blocked-by-default-everywhere

[jtagcat]

Didn't think to open uMatrix for that. Thanks for the pointer.

This signals "unless you disable the extension, this browser won't open this at all".

Adding any hint seems sane.