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Users getting "loss of session data" error while editing with Firefox
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Complete error message: Sorry! We could not process your edit due to a loss of session data. Please try again. If it still doesn't work, try logging out and logging back in.

Link to discussion on wiki:

Attempted resolution: logging out and in, clearing cookies/cache. Other browsers work, multiple computers and internet connections fail with Firefox for the users.

Event Timeline

Hi @TheDaveRoss, thanks for taking the time to report this!
This particular problem has already been reported into our bug tracking system as T151770, but please feel free to report any further issues you find. Further handling of the reported issue happens in T151770.