How To Protect Yourself from Wireshark
Wireshark often Used by Lamer Hackers to Enter your Online Account , but it supposed to be used for network troubleshooting, analysis, software and communications protocol development, and education.
This how to protect yourself from Wireshark
First : Use Only HTTPS
You May would to take a look at HTTPS Everywhere an extension for Google Chrome
Second : Use VPN or SSH Proxy
Ask your technician or your friend who know about VPN or SSH Proxy
Third : Always Use a Trusted Network
Do not login into a suspicious network name,and use a trusted network ,and never use public Internet access to login into your Online account