Keys 1-9 and related shift keys !@#$%^&*(), malfunction in browser

The keys 1-9, 0, and the related shift keys !@#$%^&*() function properly in every application, except in the Firefox browser. In short, the keys work in the XP operating system forms, fields, and in all other applications, including WORD, EXCEL, etc. When the Firefox browser is opened, these keys malfunction. When you click the above-referenced keys, the results are a blank (nothing), a 3, a 6 or an 8. Additionally, accessing the computer remotely (TeamViewer, Crossloop, etc.) and entering browser, these keys work just fine.