Running Windows 7 64 bit, sophos av, firefox 13.0.1 cannot download some add-ons.

The operating environment is summaarised in the question. Particularly I cannot download and install the add-on Forecastfox(and one or two others). Using the install option I get a message saying "There was an error downloading forecastfox weather".
If I go to the website http://www.getforecastfox.com/ and try to download from there I get a connection error on addons.mozilla.com.

As this seems to be inconsistent this could be a temporary network download error. You can also try adjusting the settings in Sophos and Zone Alarm that could possibly interfere with the downloaded file integrity. Please see [https://support.mozilla.org/en-US/kb/Firewalls this].
[http://kb.mozillazine.org/Firewalls AV/Firewalls Configuration]
I think the programming intricacies wouldn't matter as most extensions doesn't contain binary components and can be easily unpacked and read by security software. Problems may occur if the security software is doing the scanning while the file is being downloaded and then repackages it on the system, as this would change the file integrity hash.
[https://developer.mozilla.org/en/Creating_Custom_Firefox_Extensions_with_the_Mozilla_Build_System Programming details]

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