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My "Open a new tab" button will not open a new tab

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The little tab button will not open up a new tab. I can click it but no blank tab appears. I can only open new tabs by right clicking items/links and opening a new tab from that. I have tried re-downloading and upgrading but this doesn't seem to do anything about my problem.

The little tab button will not open up a new tab. I can click it but no blank tab appears. I can only open new tabs by right clicking items/links and opening a new tab from that. I have tried re-downloading and upgrading but this doesn't seem to do anything about my problem.

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