(By “tabs” I thought you meant Firefox tabs rather than tab characters!)
Do you get the same problem if you run Firefox in Safe Mode?
Safe Mode
http://support.mozilla.com/kb/Safe+Mode
Quit Firefox entirely (Ctrl+Q) and run (Alt+F2):
firefox -safe-mode
** Changed in: firefox-3.0 (Ubuntu)
Status: Incomplete => New
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blancs become tabs
https://bugs.launchpad.net/bugs/247129
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