I want to disable plugins, which i can do through add-ons manager, but every time i restart firefox they are enabled again

When i disable plugins firefox runs faster. I could uninstall the plugins, but i periodically want to use them. I have tried using click to play but i want some plugins to run automatically.
I want to disable selective plugins and have some enabled. When i do this via add-ons manager, all plugins are enable on restarting firefox.

i don't use any cleanup tools & MSE is my security software, which is rather unobtrusive and shouldn't interfere here...
i currently have one blocklisted plugin (see screenshot), but if i remember it correctly the problem was already present in my case before i had the outdated acrobat plugin installed.
sometimes when you enable/disable a plugin in the addons manager & press f5 afterwards, it immediately switches back to its old state/sometimes it will stay on the new state until a restart of the browser & in some cases it will remember the state even across sessions - it's just not working reliably in any way.
as far as i can observe the pluginreg.dat file in my profile folder the change of a plugin's state isn't written to the file as soon as it's toggled in the UI during a session, but only when the browser is getting closed - so the information has to be in the memory somewhere before and might be getting corrupted. i suspect it might be a general bug but i cannot reproduce it reliably .
''edit: forgot to attach the screenshot & i'm using the current aurora build''

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