This very much sounds like you were triggering the paste action from clipit 
(probably using a keyboard shortcut) without realizing it.
I'm closing this bug as it's unlikely to be a problem in thunderbird, feel free 
to re-open if you think it is.

** Changed in: thunderbird (Ubuntu)
       Status: Incomplete => Invalid

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https://bugs.launchpad.net/bugs/1915771

Title:
  Thunderbird randomly inserts string

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