Opening attachments gives the error : "The connection was reset. The connection to the server was reset

Opening attachments gives the error : "The connection was reset. The connection to the server was reset. I tried clearing cookies and cache, but it doesnot work. 8 out of 10 times this is happenning. It's reproducible, and happening only after the latest update.

A possible cause is security software (firewall,anti-virus) that blocks or restricts Firefox or the plugin-container process without informing you, possibly after detecting changes (update) to the Firefox program.
Remove all rules for Firefox and the plugin-container from the permissions list in the firewall and let your firewall ask again for permission to get full unrestricted access to internet for Firefox and the plugin-container process and the updater process.
See:
*https://support.mozilla.org/kb/Server+not+found
*https://support.mozilla.org/kb/Firewalls
You can also try to reset (power off/on) the router.

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