https://chrome.google.com/webstore/detail/open-multiple-urls/oifijhaokejakekmnjmphonojcfkpbbh?authuser=1?authuser=1&gclid=CjwKCAiAnZCdBhBmEiwA8nDQxZB5QXyXqGWQwov87auXb0G_DEfqczVDQnOmIiAuBp54-VmNkraCYxoCdPYQAvD_BwE That is the link to download the extension. When you open it for the first time this is what you will see:
(without the links ofc)
the first thing you do is confirm that the last check box "Preserve input" is checked
Then you can input all of the voting site links to the text box above, here are all of the sites for the lazy :)
http://www.planetminecraft.com/server/sentinelcraft-2527001/vote/
http://minecraft-server-list.com/server/156670/vote/
https://minecraft-server.net/vote/sentinelcraft/
https://topminecraftservers.org/vote/3529
http://minecraft-mp.com/server/36148/vote/
https://topg.org/minecraft-servers/server-636680
https://minecraftlist.org/vote/27321
https://minecraftpocket-servers.com/server/115787/vote/now you just click open url's and all of the sites will open
i hope this helped :D
ignorance is bliss