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Suddenly the only way to read my mail (Gmail account) is by pressing "reply" or "forward". With my other account I can simply open new mail and read it. How come?

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This happened when I restarted my computer. I did not update Firefox. The other way of reading mail is to open it via "message carbled" I have an Apple MacBook Pro.

This happened when I restarted my computer. I did not update Firefox. The other way of reading mail is to open it via "message carbled" I have an Apple MacBook Pro.

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Possibly ...

GMail entire message content missing (blank) after header title

In Firefox, if you have "Adblock Plus" extension.

  1. "Ctrl+Shift+F" Preferences (or right click on ADP symbol, and choose preferences)
  2. 'Filters' menu > "Update all subscriptions"

reference: https://support.mozilla.com/questions/896267