OK, i worked out the reason for that. It seems to be an IPv6 problem.
To install addons you have to:
1. add the following lines to /etc/sysctl.conf
net.ipv6.conf.all.disable_ipv6 = 1
net.ipv6.conf.default.disable_ipv6 = 1
net.ipv6.conf.lo.disable_ipv6 = 1
2. execute: sysctl -p
3. restart your firefox and install the addon (tested with Xmarks Bookmark
Addon)
I tried to simulate the connection via wget and realized the ipv6 adresses in
communication.
For further investigation see wget output in attachment.
Disabling IPv6 in Firefox (about:config) did NOT solve the problem for
me.
** Attachment added: "wget Output"
http://launchpadlibrarian.net/48171428/wget.txt
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Firefox is unable to download add-ons (download error -228)
https://bugs.launchpad.net/bugs/573404
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