I can't open a New Tab. Neither by clicking the + on the Tab bar, nor by File New Tab (or Ctrl+T).

When I open Firefox, I can see the homepage. When I try to open a new tab, I can't neither by clicking the + on the Tab bar, nor by File>New Tab. However, if I press a link in my home page, it opens in a new tab. ???

Uninstall the Ask toolbar and it should work again. There is a compatibility issue with the Ask toolbar and Firefox that prevents new tabs from being opened.
There are a couple of places to check for the Ask toolbar:
* Check the Windows Control panel for the Ask Toolbar - http://about.ask.com/apn/toolbar/docs/default/faq/en/ff/index.html#na4
* Also check your list of extensions, you may be able to uninstall it from there - https://support.mozilla.com/kb/Uninstalling+add-ons

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