Could your issue be related to this one, I wonder:
Further, it seems that an upgrade yesterday to Online Safety and Safe Search provided some fixes for Firefox issues. Have you tried reinstalling the Browser Extension in Online Safety > Settings?
To add to my original post:
I've verified the problem on two computers. One computer runs Windows 7 SP1 32-bit, and the other runs Windows 8.1. The problem exists for FF 29.0.1 and FF ESR 24.5.0. IE 11 is not affected. I have not checked my XP computer yet.
I don't have No Script.
The problem began after the recent update to Online Safety (ver 2.107.2552). I assume this update was a fix for the XP incompatibility discussed in other threads.
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