How do you add custom tabs?

[iGiftedSpade]

there isn’t an option to add or remove tabs but there certainly is this instruction trekie posted.

Fixing Messenger's tabs to use the latest version of IE

Some of the more recent tabs now added in Messenger do not appear correctly or throw javascript errors due to the IE WebBrowser Control which defaults to IE7 mode unless you tell it otherwise. Thankfully, it’s easy to fix most of them by adding some values into the registry. Quick fix Close Messenger fully - right-click Messenger’s icon in the notification area (by the taskbar clock) and choose Exit Download and run this .reg file Run the .reg file, confirm administrator rights for the regi…