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purple box appears in upper left corner of Firefox. It seems to contain a to do list of some sort all with an x through them as though they have been completed it disappears only to re-appear later.

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purple box appears in upper left corner of Firefox. It seems to contain a to do list of some sort all with an x through them as though they have been completed it disappears only to re-appear later.

purple box appears in upper left corner of Firefox. It seems to contain a to do list of some sort all with an x through them as though they have been completed it disappears only to re-appear later.

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Do you have that problem when running in the Firefox SafeMode?
http://support.mozilla.com/en-US/kb/Safe+Mode
Don't select anything right now, just use "Continue in SafeMode."

If not, see this:
http://support.mozilla.com/en-US/kb/troubleshooting+extensions+and+theme...