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.
Solution choisie
I will further investigate what is happening with Zone Alarm and see if there is any way that it can be set so that it does not prevent me from using my PC as I want.
Thanks for your suggestions.
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Hi,
You can try to right-click on the Add to Firefox link and Save link as. You can then drag and drop the downloaded file into Firefox to install. If the problem persists you can also try to install/download after some time. To check for possible service problems, please see this.
Thanks for the suggestion. However, when I tried it I got the message "This add-on could not be installed because it appears to be corrupt." The downloaded file forecastfox_weather-2.2.1-fx+sm.xpi was 421kb in size.
Do you have any other ideas, because I don't?
As a matter of interest, I tried to do the same on my work PC which has the same configuration as my home PC and had exactly the same problem. This leads me to suspect that there is something about the combination of 64 bit win 7, Sophos and Zone alarm.
I don't know if it helps with working out the problem. I have been able to install FireFTP 2.0.5, IE View 1.5.1, Weather Watcher Live 1.0.18 and British English dictionary 1.19.1.
Is there something about the programming language used in the add-ons?
All very odd.
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 this.
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.
On investigation I find that it is Zone Alarm which is causing the problems. I have shut it down - but activated Windows Firewall - and I can now download the add-ons that I want.
Thanks for the update. You can mark it as the answer and also add details if any, which could be helpful for a lot of users in similar situations.
Solution choisie
I will further investigate what is happening with Zone Alarm and see if there is any way that it can be set so that it does not prevent me from using my PC as I want.
Thanks for your suggestions.
No problem :)