Some not so known features FF3
1. To copy a tab, you need to drag it into free space with Ctrl pressed.
2. To move a tab to another window, simply drag it to any place on that window. If the tab was 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 disconnected pieces of text with Ctrl pressed.
5. about: crashes will show browser crash reports
Source (I wrote not all features here, but only those that seemed to me really interesting)
2. To move a tab to another window, simply drag it to any place on that window. If the tab was 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 disconnected pieces of text with Ctrl pressed.
5. about: crashes will show browser crash reports
Source (I wrote not all features here, but only those that seemed to me really interesting)
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Source: https://habr.com/ru/post/28805/
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