I have a similar problem; when I open a new window, close it, and then restore the closed window from history--it opens in a tiny window with tiny letters and tiny buttons. Haven't figured out what is causing this; I have managed to confirm it is not being caused by any add-ons (well, perhaps installing one of the add-ons might initially trigger this, but disabling all add-ons doesn't fix the problem).
I'd recommend you take a backup of your bookmarks (Bookmarks > Show All Bookmarks > Import and Backup > Backup), note any password and other settings you need to keep, note which add-ons you have installed and how you have configured them, and rename your Firefox folder so you start with a clean profile (this way you can always rename it back to recover your current profile). Then follow the same route for the bookmarks, but now select to restore from file and load your backup. To rename the folder, run this command from the terminal:
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mv ~/.mozilla ~/mozzila-OLD
If everything works, you can delete the mozzila-OLD folder from your home folder afterwards.