How can switch night mode and add block mode

i cant see night mode in mozilla

hi, i'not sure what you are referring to by "night mode" - this is not something that is present in the normal firefox release channel, but the firefox developer edition does feature a dark theme: firefox.com/developer
in order to block ads in firefox, you can use an extension like adblock:
https://addons.mozilla.org/firefox/addon/adblock-plus/

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