Firefox opens outside desktop, in upper left corner, out of reach. Fix?

Recently, Firefox opens too far outside the desktop to access, beyond the upper-left corner. This is intermittent, no discernible pattern. When it does open again visibly, it is contracted to a small size and must be manually resized.
This problem has been occasionally occuring for a while, since before this latest upgrade.

Mozilla are aware of this issue and are trying to establish the cause.
* https://bugzilla.mozilla.org/show_bug.cgi?id=641288 - Preferences window opens offscreen without titlebar, leaves white square when closed, can't be moved
* https://bugzilla.mozilla.org/show_bug.cgi?id=636937 - A cube shaped "dead" square after opening and closing the Preferences

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*https://support.mozilla.com/kb/Safe+Mode
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*http://kb.mozillazine.org/Toolbar_customization
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''moderator dismantled the hyperlink - not appropriate to provide a direct install link here''

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Try posting here - http://forums.mozillazine.org/viewforum.php?f=19 - a forum for extension development.

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Mha007:
Sorry, but I have already tried this too and verified that the web addresses are listed as Allow, rather than Block. After restart there was no difference, I still get the disappearing pop-up windows.
Thanks for offering suggestions though.
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Firefox opens outside desktop, in upper left corner, out of reach. Fix?

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