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... but unfortunately it breaks the Add-On "Clean Uninstall". The Options-Window ist totally blank. Workaround: deactivate NR-URI-L, start Firefox new and then delete the Add-On you want to get rid of.

Это отзыв для предыдущей версии этого дополнения (0.1.0). 

Thank you for the report. It seems this add-on was blindly marking about:addons (or any about:) as untrusted, which is harmless but breaks a small number of add-ons.
https://notabug.org/desktopd/no-resource-uri-leak/issues/1

Version 0.2.0 fixed this issue.

For support you can use (instead of reviews):
* Support thread: https://discourse.mozilla-community.org/t/support-no-resource-uri-leak/9004
* Issue tracker: https://notabug.org/desktopd/no-resource-uri-leak/issues