My tabs began to hide when I go down to two legs

If I have a lot of tabs open, each of them will remain visible, but if I start the closing of tabs when I get down to two of them will disappear. If I open another hidden tab that comes back, and if I remove the tabs then a mask once again. I'm on a windows 7 and my tabs are set to stay visible if multiple tabs are open. This problem started a few days when my default search engine suddenly changed to bing on my address bar. I solved this problem but I can't find any mention of anyone with a similar problem with the tabs endangered.

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Tags: Firefox

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