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I've had several flash drives mount themselves as "read only", which will lock up on a write. This was usually because the file system had become corrupted. Running "dosfsck" from the command prompt fixes it up. Make backups first, even if you never use them. This is the only time you can do that. Do a "man dosfsck" from the command prompt to see what you are getting into first.
The black bar in the navigation toolbar in Firefox is often caused by trying to use a buggy theme. Go to Tools ->Add-ons ->Appearance to see what theme is in effect. Select and enable a different one (I suggest the inital default theme) and see if the black bar goes away.
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