Since you cannot install Firefox, try these :
If you are determined to try every possible browser, follow this safe protocol. Windows Ce 6.0 Mozilla Firefox Download - Google
The landscape of legacy technology is vast and often confusing. In an era where modern web browsers demand gigabytes of RAM and multi-core processors, there remains a dedicated user base relying on the stripped-down efficiency of Windows CE 6.0. Whether you are an industrial integrator, a retro-tech enthusiast, or attempting to revive an old handheld terminal, you have likely found yourself typing the query into a search engine, only to be met with broken links and confusion. Since you cannot install Firefox, try these :