I can not get a new tab to open. It opens a new tab when I go to Firefox Help but not when I want to open a bookmark of other web site.

When I click on the tab bar I will not open a new tab.

That can be a problem with the Ask<i></i>.com toolbar (Tools > Add-ons > Extensions)
Start Firefox in [[Safe Mode]] to check if one of the add-ons is causing the problem (switch to the DEFAULT theme: Tools > Add-ons > Themes).
* Don't make any changes on the Safe mode start window.
See:
* [[Troubleshooting extensions and themes]]

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