Filter Button only shows if you do the search from firefox search bar (Right to the address bar.)
It doesn't show if you do by going to google.com directly.
A known issue unfortunately - most of OG doesn't work if you go to google.com directly because they load their page in a different way. This is (obviously) high on my list of priorities for OG, and hopefully I'll actually find enough time to fix it!
Please Fix This. Extension not Work at this Time correct.
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