About reducing useless extensions, please don't use nor recommend cookie autodelete and I don't care about cookies (which has been acquired by avast or some similar company iirc).
Firefox (and any other modern browser) has settings to delete website cookies on exit and to block third party cookies, while giving the ability to whitelist for both features.
For the annoying cookie popups just enable the adguard annoyances lists in ublock origin, which you already want to install on a browser anyways.
Fyi you don't need two adblockers on the same browser. They use the same lists anyways, you're using double the resources and improving load times for no real benefit
My bad, I misread it