I have that list enabled, the pop-ups still hang around. I don’t care about cookies tends to catch them. I don’t know why there’s a difference.

I used uMatrix for many years, that is until it was retired. Raymond Hill no longer maintains/updates the addon and the github was archived in July 2021. There are some forks but none appear to be in active development. Just be aware the version of uMatrix on addons.mozilla.org is now 2 years old and may not be blocking everything it claims to be.

Have a look at EDCopilot Amongst all the other things it can do it also has a ship control panel. You’ll need to use it in conjunction with SpaceDesk I know nothing of SpaceDesk just found out about it when checking the EDCopilot Discord.

EDDiscovery from the site summary “In short it’s a 3rd party tool that can track your Elite Dangerous travels, combat, trading, rank etc.”
This seriously undersells the capability of this tool - check the wiki for more info.

https://troynt.github.io/elite_dangerous_controls_reference/ import your keybindings file and view/search them through your browser.