There's add-ons for Firefox to do this, switching twitter accounts without having to sign-in 3-5 times a day is really time saving if you have more than 2 accounts, CookieSwap do the job, is there any possible extension can do the job for safari?
Switch Twitter Accounts in Safari
safarisafari-extensions
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Best Answer
There is no add-ons on Safari who is doing that.
Chrome : https://chrome.google.com/webstore/detail/swap-my-cookies/dffhipnliikkblkhpjapbecpmoilcama
Mozilla : https://addons.mozilla.org/fr/firefox/addon/cookieswap/
By the way, I think you have to post your wish here : https://www.reddit.com/r/SomebodyMakeThis/