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the "open a new tab" icon does not open a new tab

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To the right of any open tab is an "open a new tab" option. This used to work, but since the last update, it does nothing.

To the right of any open tab is an "open a new tab" option. This used to work, but since the last update, it does nothing.

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This issue can be caused by the Ask.com toolbar (Tools > Add-ons > Extensions)

Your system details show that toolbar in the user agent as AskTbNCH/3.11.3.15590

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).