Firefox is not supported on Symbian platforms. So you can't have it there.

   We currently have no plans to develop a full Firefox browser for the Symbian platform. See Mobile/Symbian for notes from an inactive project to port Firefox to Symbian. However, a future version of Firefox Home may be available for Symbian. 

https://wiki.mozilla.org/Mobile/Platforms Symbian We currently have no plans to develop a full Firefox browser for the Symbian platform. See Mobile/Symbian for notes from an inactive project to port Firefox to Symbian. However, a future version of Firefox Home may be available for Symbian. Also note that Nokia is laying off some 4000 people by end of year and a additional some 2,800 to be transfer to consulting firm Accenture, all because of switch to Windows 7 OS. Now Nokia is planning to lay off an laying additional 3,500 employees. Still think Symbian is is a piratical OS to make Firefox for? There was a Symbian project in past now long since inactive. https://wiki.mozilla.org/Mobile/Symbian