Why can't I use backspace button or go back and edit typed text?

I recently upgraded my OS to 10.6.8 on my mac mini, allowing me to update my Firefox. Ever since then, when typing any text, such as this one, or in an email, or a comment post on a blog, I am unable to use the backspace button, go back and edit any text, and at times no key on my keyboard works at all. Intensely frustrating and I have no idea what is going on. Please let me know what settings to change so that I can go back correct spelling, make edits, backspace, all the normal usual things that a person does when typing text. Thank you.

As a temporary band-aide, can you mark the part you want to edit and type
over it? Try doing these things;
 Clear the Cache '''''Firefox/Tools > Options > Advanced > Network > Cached Web Content: "Clear Now"''''' 
and 
Remove Cookies '''''Firefox/Tools > Options > Privacy > Cookies: "Show Cookies"''''' 
'''''[https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-using-safe-mode Start Firefox in Safe Mode]'''''
Hold down the '''''Shift''''' key (On '''Mac''' the '''''Options''''' key) while starting Firefox to start in Safe Mode

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