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after I establish a few tabs, they soon disappear, how can I remedy ?

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I follow the steps to establish tabs, and It works OK. However, as I continue on the internet, I soon notice the tabs have disappeared and I don't know why they don't remain on the tab bar. I have tried several times, with the same result. Can you tell me where I am going wrong?

I follow the steps to establish tabs, and It works OK. However, as I continue on the internet, I soon notice the tabs have disappeared and I don't know why they don't remain on the tab bar. I have tried several times, with the same result. Can you tell me where I am going wrong?

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Start Firefox in Diagnose Firefox issues using Troubleshoot Mode to check if one of the extensions is causing the problem (switch to the DEFAULT theme: Firefox (Tools) > Add-ons > Appearance/Themes).