Some not so well-known FF3 features

    1. To copy a tab, you need to drag it into the free space with Ctrl pressed.
    2. To move a tab to another window, you just need to drag it to anywhere in this window. If the tab was the last, the previous window will close automatically.
    3. The size of the search field next to the address bar can be changed by dragging the bulkhead between them.
    4. You can select several incoherent pieces of text with Ctrl pressed.
    5. about: crashes will show reports about browser crashes

    Source (I wrote here not all the features, but only those that seemed to me really interesting)

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