What Version of CM 14 are you using?
From what ive heard from oracle firefox is the preferred browser due to how its able to process java. I know on SP1 and 2 they did some enhancements for how it runs in IE.
From the Contract Management login screen, the build number should show as 14.0.1.00 if your installation of Contract Management has been upgraded to CM 14 SP1. The build number and version numbers are as follows:
Contract Management 14.0 Service Pack 2 2456 14.0.2.00
Contract Management 14.0 Service Pack 1 Hotfix 4 2279 14.0.1.00
Contract Management 14.0 Service Pack 1 Hotfix 3 2273 14.0.1.00
Contract Management 14.0 Service Pack 1 Hotfix 2 2263 14.0.1.00
Contract Management 14.0 Service Pack 1 2252 14.0.1.00
Contract Management 14.0 2186 14.0.0.00
If possible, your IT Department should be able to download SP 2 from the My Oracle Support site ( http://support.oracle.com ) and download the patch and implement it in your environment.
As for web browsers, yes Mozilla Firefox does function much smoother however some of the bugs that were addressed in the service pack allow for Internet Explorer 9 to function better.