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"posts update admission post back" keeps popping up in yahoo search bar and hijacking page on Firefox only. No malware detected. How do I get rid of it???

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Tabs will be open, minding their own business, and suddenly the At&T /Yahoo address/search bar will change to "posts update admission post back' and will show search results. It only happens in firefox. I ran malwarebytes and it found several ads which it successfully deleted, but that hasn't made any difference in this issue coming up. Web searches come up with people with the same issue, but no resolution... Any ideas?

Tabs will be open, minding their own business, and suddenly the At&T /Yahoo address/search bar will change to "posts update admission post back' and will show search results. It only happens in firefox. I ran malwarebytes and it found several ads which it successfully deleted, but that hasn't made any difference in this issue coming up. Web searches come up with people with the same issue, but no resolution... Any ideas?

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Try disabling the Yahoo Toolbar extension =
Yahoo! Toolbar 3.1.0.20130818030116 ({635abd67-4fe9-1b23-4f01-e679fa7484c1})