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That is already available with NoScript. https://addons.mozilla.org/en-US/firefox/addon/noscript/ https://addons.mozilla.org/en-US/firefox/addon/noscript/ You

by gvb 15y ago

That is already available with NoScript. https://addons.mozilla.org/en-US/firefox/addon/noscript/ https://addons.mozilla.org/en-US/firefox/addon/noscript/ You can whitelist (and blacklist) sites temporarily or permanently.