In the function SelectionController::setModifyBias(), the case EXTEND: is be hit before m_modifyBiasSet has been initialized. The case funciton looks like this: case EXTEND: if (!m_modifyBiasSet) { m_modifyBiasSet = true; .... It is being hit when the user first starts to type something into the search box on www.google.com. Not sure what the value should be initialized to.
From the looks of the code, it seems as if the value should be initialized to false.
Created attachment 11259 [details] patch to init value to false
Comment on attachment 11259 [details] patch to init value to false r=me
Landed in r17400.