The problem can be corrected by updating your system to the following package versions: Ubuntu 11.04: xul-ext-mozvoikko 1.10.0-0ubuntu0.11.04.1 xul-ext-ubufox 0.9.2-0ubuntu0.11.04.1 xul-ext-webfav 1.17-0ubuntu5.2 After a standard system update you need to restart Firefox to make all the necessary changes.
https://ubuntu.com/security/notices/USN-1222-1
https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/857098
https://launchpad.net/ubuntu/+source/mozvoikko/1.10.0-0ubuntu0.11.04.1 https://launchpad.net/ubuntu/+source/ubufox/0.9.2-0ubuntu0.11.04.1 https://launchpad.net/ubuntu/+source/webfav/1.17-0ubuntu5.2
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