Pinnacle is a system used by CIS to bill some departments. If you don't yet have access, you can request access online.

You can log in to Pinnacle at https://www.brown.edu/pinnacle with your Brown username and password.
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**NOTE  In order to access your Pinnacle bill via the web; you must be using 
version 5.5 or higher of Internet Explorer. Do not use Google Chrome.

Firefox can work with Pinnacle, but it requires some modification. 
Open a new tab.
Type in about:config in the URL field and press enter.
Click on "I'll be careful, I promise!"
Search for security.tls 
Change the value of security.tls.version.fallback-limit from 3 to 1.
You may need to restart Firefox for this change to take affect.