The browser tab uses the title of the page you are on.  If you have multiple tabs open, this helps you know what each is being used for.

Override Tab Title is an Advanced Global Feature, introduced in 7.10. Therefore make sure you switch on Include Advanced to find this feature.

This global feature allows you to add a global name in front of that title. If enabled, the default tab title name is ShareDo.  Click the cog icon to change the title.

Example tab titles with the ShareDo title not enable and enabled:

Enabled:   

No Enabled: