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Answer : You're not using splice correctly: arr.splice(4, 1) this will remove 1 item at index 4. see here I think you want to use slice: arr.slice(0,5) this will return elements in position 0 through 4. This assumes all the rest of your code (cookies etc) works correctly The fastest and simplest way is by setting the .length property to the desired length: arr.length = 4; This is also the desired way to reset/empty arrays: arr.length = 0; Caveat: setting this property can also make the array longer than it is: If its length is 2, running arr.length = 4 will add two undefined items to it. Perhaps add a condition: if (arr.length > 4) arr.length = 4; Alternatively: arr.length = Math.min(arr.length, 4); arr.length = Math.min(arr.length, 5)

Answer : Currently, this is not possible. You can use multiple profiles in Google Chrome, though. Read the instructions here. Enable multiple accounts: https://www.google.com/accounts/MultipleSessions Then, create a bookmark(let) or a keyboard shortcut for each mailbox: https://mail.google.com/mail/u/0/#inbox https://mail.google.com/mail/u/1/#inbox Source: http://lifehacker.com/5733636/switch-between-multiple-gmail-accounts-with-a-url-hack MultiLogin is down from the google webstore, but there is an alternative (SessionBox) https://chrome.google.com/webstore/detail/sessionbox-beta/megbklhjamjbcafknkgmokldgolkdfig