We support two browsers as well, IE and Firefox. After trying various methods, we decided to go with a prepackaged solution called PolicyPak, put out by a company of the same name. They have a software product that integrates third party applications such as the browsers you mention with Group Policy, allowing you to make GPOs for just about any primary application out there. Real easy solution to implement to. They offer both a trial package as well as something called community mode, both of which are free. Here is a link about their Firefox product. http://www.policypak.com/products/manage-firefox-with-group-policy.html
check it out. Later
You didn't state which version of the Windows Server operating system is hosting Active Directory. Windows 2003 doesn't offer Preferences in GPOS, Windows 2008 R2 and above does, etc.
Chrome Policy Basics
http://www.techrepublic.com/blog/google-in-the-enterprise/install-chrome-via-gpo-and-save-yourself-some-time/
https://support.google.com/chrome/a/answer/187202?hl=en
Mozilla Firefox
http://support.kaspersky.com/3894
http://www.websense.com/content/support/library/web/hosted/getting_started/firefox_adgp.aspx
Opera
http://my.opera.com/community/
I have not seen that browser in any of my Fortune 500 clients in the past, so I am afraid that I don't have any insight on GPO tricks for it.
My recommendation would be to consolidate onto IE, Chrome and Firefox and allow Opera once they have an established ADMX file for use with AD.
I am sure your organization has an IT policy which states that IT must be able to control security settings on systems.
How Can I Manage Third Party Web Browsers with Group Policy
My life would be a lot simpler if I could manage Chrome, Firefox and Opera (which we have found appearing on desktops as well) using Group Policy in the same fashion as IE. Does anyone have a solution for this? Surely someone has this same situation. Any guidance in this matter would be greatly appreciated.