Here is how you can programmatically cast your 30 witness votes on Steemit

This simple tutorial allows you to cast your Steemit witness votes account in a bunch of seconds, simply pasting a script in any browser.

NOTES:

• This script requires that you enter your account's active key in the script in order to make it work.

It is completely safe though! If you have a basic understanding of Javascript you can verify yourself that your keys are not sent or stored anywhere besides Steem API!

STEP 1

Open your favorite browser on ANY site (I strongly recommend using Brave browser for its security and speed!)
and open the DevTools (Ctrl + Shift + J on Linux/Windows and Cmd + Opt + J on Mac)

STEP 2

Open a new tab, navigate to https://cdn.jsdelivr.net/npm/steem/dist/steem.min.js (SteemJs)
and copy and paste (Ctrl + A and Ctrl + C) the steem.js minified code into the Browser Console (DevTools) that you opened in the first tab.

STEP 3

Copy and paste my script below in the Console.

Note: before pressing enter change the myAccount and privateActiveKey with your credentials and feel free to change the list of witnesses that you want to vote for.
The list of witnesses in my code snippet was taken from Hive account@enforcer64.
If you want to follow some else's choice of witnesses visit their steemd page (eg. Hive account@theycalledmedan -> https://steemd.com/@theycallmedan) and copy their list from the "Hive account@theycallmedan votes for:" section.

var myAccount = 'gaottantacinque';
var privateActiveKey = '5Kb************************************3Nrd';

var witnessesToVote =  [
  'anyx',
  'ats-witness',
  'ausbitbank',
  'blocktrades',
  'bobinson',
  'c-squared',
  'c0ff33a',
  'coingecko',
  'dragosroua',
  'drakos',
  'emrebeyler',
  'good-karma',
  'gtg',
  'guiltyparties',
  'isnochys',
  'klye',
  'netuoso',
  'nextgencrypto',
  'ocd-witness',
  'patrice',
  'pharesim',
  'qurator',
  'r0nd0n',
  'roelandp',
  'someguy123',
  'steempeak',
  'steempress',
  'stem.witness',
   // 'themarkymark', // sorry, not a fan
  'yabapmatt',
];

// Remove all votes
var getMyAccountWitnessVotes = () => new Promise((resolve) => {
  console.log(`Checking witnes votes for ${myAccount}`);
  steem.api.getAccounts([myAccount], (err, result) => {
    if (err) {
      throw new Error(`Unable to get witness votes for ${myAccount}`);
    }
    resolve(result[0].witness_votes);
  });
});

// Value: [1 = vote, 0 = unvote]
var voteForWitness = (witnessName, value) => new Promise((resolve) => {
  console.log(`${value ? 'Voting' : 'Unvoting'} for ${witnessName}..`);
  steem.broadcast.accountWitnessVote(
    privateActiveKey, myAccount, witnessName, value,
    (err, result) => {
      if (err) {
        throw new Error(`Unable to vote for ${witnessName}`);
      }
      resolve(result);
    });
});

var replaceAllWitnessVotes = async () => {
  const myOldVotesArr = await getMyAccountWitnessVotes();
  for (let id = 0; id < myOldVotesArr.length; id++) {
    const currentWitness = myOldVotesArr[id];
    const res = await voteForWitness(currentWitness, 0);
    console.log(currentWitness, 'unvoted.', res);
  }
  for (let id = 0; id < witnessesToVote.length; id++) {
    const newWitness = witnessesToVote[id];
    const res = await voteForWitness(newWitness, 1);
    console.log(newWitness, 'voted.', res);
  }
  console.log('All done.');
}
replaceAllWitnessVotes();

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You prefer clicking buttons around? Visit https://steemitwallet.com/~witnesses.

No matter what you are more comfortable with, please cast your witness votes as this is a critical time for Steemit!