You might have done multiple selecting of files in windows and then copy-paste them. Now Mozilla brings this cool feature to Firefox 3. The difference here is you select multiple text lines rather than the files.
The method is just the same you did you copying files in Windows. Press the CTRL key on keyboard, select different lines with mouse and then press CTRL + C to copy the selected lines. For pasting it anywhere, just press CTRL + V. Simple Isn’t it?
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